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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 | 2,231,532 us-gaap_TreasuryStockSharesAcquired |  |  |  |  |
Average price per share (repurchased) | $ 2.31 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |  |
Treasury stock, shares | 2,231,532 us-gaap_TreasuryStockNumberOfSharesHeld |  | 2,215,111 us-gaap_TreasuryStockNumberOfSharesHeld |  |  |
Common stock additional shares repurchased | 77,502 ccel_CommonStockAdditionalShareRepurchased |  |  |  |  |
Average price per share additional repurchased | $ 2.54 ccel_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 | 16,421 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 217,751 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Average price per share (repurchased) | $ 2.38 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 2.08 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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- Definition Common stock repurchase average price per share. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Description of share repurchase program, including accounting treatment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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- Definition Number of shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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