Stockholder's Equity - Additional Information (Detail) - USD ($)
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1 Months Ended |
3 Months Ended |
6 Months Ended |
12 Months Ended |
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Dec. 01, 2013 |
May. 31, 2012 |
May. 31, 2015 |
Feb. 28, 2015 |
May. 31, 2014 |
May. 31, 2015 |
May. 31, 2014 |
Nov. 30, 2014 |
Nov. 26, 2014 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share distribution period |
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20 days
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| Granted, Shares |
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0
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0
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0
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0
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| Shares granted during period |
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0
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| Common stock, par value |
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$ 0.01
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$ 0.01
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$ 0.01
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| Common shares exchange ratio |
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One Common Share per Right
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| Preferred Stock, redemption price Per Share |
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$ 0.01
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$ 0.01
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| Market price for common stock, percentage |
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50.00%
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| Assets sale percentage |
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50.00%
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| Rights expiration date |
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Dec. 05, 2017
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| 2000 Plan [Member] | Employee Stock Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock for issuance pursuant to stock options or restricted stock |
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2,250,000
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2,250,000
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| Share distribution period |
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3 years
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| Options exercisable period after termination |
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90 days
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| Shares outstanding under stock incentive plan |
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2,500
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2,500
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2,500
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| Shares issued under stock incentive plan |
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0
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0
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| 2000 Plan [Member] | Minimum [Member] | Employee Stock Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Term of options |
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5 years
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| 2000 Plan [Member] | Maximum [Member] | Employee Stock Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Term of options |
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7 years
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| 2006 Plan [Member] | Employee Stock Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock for issuance pursuant to stock options or restricted stock |
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1,000,000
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1,000,000
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| Shares outstanding under stock incentive plan |
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582,264
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582,264
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594,766
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| Shares issued under stock incentive plan |
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272,845
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272,845
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| 2012 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock for issuance pursuant to stock options or restricted stock |
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1,500,000
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1,500,000
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| Shares issued under stock incentive plan |
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1,795,911
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1,795,911
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| 2012 Plan [Member] | Employee Stock Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Increase in common stock reserved for issuance |
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2,500,000
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| Preferred Stock Rights Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock, par value |
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$ 0.01
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| Terms for right to purchasing preferred stock |
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Each Right represents the right to purchase from the Company one one-thousandth (1/1,000) of a share of Series A Junior Participating Preferred Stock (the "Preferred Shares"), subject to adjustment as provided in the Rights Agreement. This fraction of a Preferred Share is substantially similar to a Common Share, in that the Rights Agreement provides for each Preferred Share to have the voting, liquidation and dividend rights that are equivalent to 1,000 times the rights of a Common Share.
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| Stock Option [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options exercised |
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$ 0
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$ 48,665
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| Number of share issued to option holder |
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32,496
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| Stockholder Rights Agreement [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Acquisition of common stock outstanding percentage |
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20.00%
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20.00%
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| Addition of common stock outstanding percentage |
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0.25%
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| Increase in common stock outstanding percentage |
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22.50%
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| Service Based Option [Member] | 2012 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, Shares |
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400,000
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400,000
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| Service Based Restricted Shares [Member] | 2012 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, Shares |
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129,729
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129,729
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| Performance Based Options [Member] | 2012 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, Shares |
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116,240
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58,120
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| Market Based Options [Member] | 2012 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, Shares |
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58,120
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58,120
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| Service-Based Vesting Condition Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares outstanding under stock incentive plan |
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984,764
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984,764
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997,266
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| Granted, Shares |
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0
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| Service-Based Vesting Condition Options [Member] | 2000 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation cost related to non-vested share-based compensation arrangements granted |
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$ 9,300
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$ 9,300
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| Service-Based Vesting Condition Options [Member] | 2006 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation cost related to non-vested share-based compensation arrangements granted |
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9,300
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9,300
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| Service-Based Vesting Condition Options [Member] | 2012 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation cost related to non-vested share-based compensation arrangements granted |
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9,300
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$ 9,300
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| Service-Based Vesting Condition Options [Member] | Stock Option [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Weighted-average period |
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3 months
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| Total fair value of shares vested |
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$ 31,000
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| Restricted Common Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation cost related to non-vested share-based compensation arrangements granted |
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$ 40,000
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$ 40,000
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| Description of minimum requirement to be satisfied by employee for restricted common share |
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The Employment Agreements state if David Portnoy and Mark Portnoy are employed by the Company on November 30, 2014, then no later than February 15, 2015, the Company will grant up to 186,487 and 162,163 shares of restricted common shares, respectively, based on certain performance thresholds, as defined in the agreements.
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| Description of minimum requirement to be satisfied by employee for additional restricted common share |
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In addition, if David Portnoy and Mark Portnoy are employed by the Company on November 30, 2015, then no later than February 15, 2016, the Company will grant up to an additional 186,487 and 162,163 shares of restricted common shares, respectively, based on similar performance thresholds, as defined in the agreements.
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| Restricted Common Shares [Member] | David Portnoy [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock for issuance pursuant to stock options or restricted stock |
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186,487
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186,487
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| Number of share issued to option holder |
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93,244
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| Additional restricted common shares to be granted |
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186,487
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| Restricted Common Shares [Member] | Mark Portnoy [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock for issuance pursuant to stock options or restricted stock |
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162,163
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162,163
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| Number of share issued to option holder |
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81,082
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| Additional restricted common shares to be granted |
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162,163
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| Restricted Common Shares [Member] | 2012 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share based compensation, percentage of vesting upon grant |
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33.33%
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| Share based compensation vested period fair value |
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$ 200,000
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| Restricted Common Shares [Member] | 2012 Plan [Member] | December One Two Thousand Fourteen [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share based compensation, percentage of vesting upon grant |
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33.33%
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| Restricted Common Shares [Member] | 2012 Plan [Member] | December One Two Thousand Fifteen [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share based compensation, percentage of vesting upon grant |
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33.33%
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| Restricted Common Shares [Member] | 2012 Plan [Member] | David Portnoy [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted during period |
70,270
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| Restricted Common Shares [Member] | 2012 Plan [Member] | Mark Portnoy [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted during period |
59,459
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| Market Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation cost related to non-vested share-based compensation arrangements granted |
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$ 47,000
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$ 47,000
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