Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Plan - Additional Information (Detail)

v2.4.1.9
Share Repurchase Plan - Additional Information (Detail) (USD $)
3 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Nov. 30, 2014
Jun. 06, 2012
Dec. 31, 2011
Apr. 08, 2015
Schedule of Share Repurchase Plan [Line Items]            
Number of shares authorized to repurchase       (3,000,000)us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased (1,000,000)us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased  
Share repurchase plan Open market purchases, privately negotiated block trades, unsolicited negotiated transactions, and/or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission          
Number of shares repurchased 2,231,532us-gaap_TreasuryStockSharesAcquired          
Average price per share (repurchased) $ 2.31us-gaap_TreasuryStockAcquiredAverageCostPerShare          
Treasury stock, shares 2,231,532us-gaap_TreasuryStockNumberOfSharesHeld   2,215,111us-gaap_TreasuryStockNumberOfSharesHeld      
Common stock additional shares repurchased 77,502ccel_CommonStockAdditionalShareRepurchased          
Average price per share additional repurchased $ 2.54ccel_CommonStockRepurchaseAveragePricePerShare          
Subsequent Event [Member]            
Schedule of Share Repurchase Plan [Line Items]            
Number of shares authorized to repurchase           (6,000,000)us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Common Stock [Member]            
Schedule of Share Repurchase Plan [Line Items]            
Number of shares repurchased 16,421us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
217,751us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Average price per share (repurchased) $ 2.38us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 2.08us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember