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Share Repurchase Plan - Additional Information (Detail) (USD $) | 6 Months Ended |  |  |  |  |  | 6 Months Ended
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May 31, 2014 | Nov. 30, 2013 | Jun. 06, 2012 | Dec. 31, 2011 | May 31, 2014 Saneron [Member] | Nov. 30, 2013 Saneron [Member] | May 31, 2014 Common Stock [Member] | May 31, 2013 Common Stock [Member]
Schedule of Share Repurchase Plan [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to repurchase |  |  | (3,000,000) | (1,000,000) |  |  |  |
Number of shares repurchased | 1,763,346 |  |  |  |  |  | 636,531 | 300,391
Average price per share (repurchased) | $ 2.18 |  |  |  |  |  | $ 2.21 | $ 2.22
Treasury stock, shares | 1,913,446 | 1,276,915 |  |  | 150,100 | 150,100 |  |
Shares repurchase plan | Open market purchases, Privately negotiated block trades, Unsolicited negotiated transactions, and/or trading plan in accordance with Rule 10b5-1 of the Securities and Exchange Commission |  |  |  |  |  |  |
Common stock additional share repurchased | 52,940 |  |  |  |  |  |  |
Average price per share additional repurchased | $ 2.69 |  |  |  |  |  |  |

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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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