Quarterly report pursuant to Section 13 or 15(d)

Legal Proceedings - Additional Information (Detail)

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Legal Proceedings - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Oct. 11, 2013
May. 26, 2011
Dec. 31, 2013
May. 31, 2015
Case No. 811-CV-399-T-30AEP [Member]        
Loss Contingencies [Line Items]        
Minimum jurisdictional amount   $ 75,000    
Settlement fee paid     $ 525,000  
Ki Yong Choi [Member]        
Loss Contingencies [Line Items]        
Shareholder derivative complaint date       Nov. 13, 2013
Case No. 13-CA-D09980 [Member]        
Loss Contingencies [Line Items]        
Minimum jurisdictional amount $ 75,000