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Share Repurchase Plan - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 14, 2015 | Jun. 30, 2015 | Aug. 31, 2015 | Aug. 31, 2014 | Apr. 08, 2015 | Nov. 30, 2014 | Jun. 06, 2012 | Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to repurchase |  |  |  |  | (6,000,000) |  | (3,000,000) | (1,000,000)
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 |  |  |  |  |
Tender offer to purchase common stock price per share |  | $ 3.25 |  |  |  |  |  |
Percentage of outstanding common shares purchased under tender offer |  | 7.76% |  |  |  |  |  |
Tender offer sales price |  | $ 2.29 |  |  |  |  |  |
Number of shares repurchased |  |  | 3,173,536 |  |  |  |  |
Average price per share (repurchased) |  |  | $ 2.54 |  |  |  |  |
Treasury stock, shares |  |  | 3,173,536 |  |  | 2,215,111 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased | 12,405 |  |  |  |  |  |  |
Average price per share (repurchased) | $ 3.44 |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Tender offer to purchase common stock shares |  | 750,000 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased |  | 557,805 | 957,956 | 968,302 |  |  |  |
Average price per share (repurchased) |  | $ 3.25 | $ 3.08 | $ 2.37 |  |  |  |
Share repurchase plan, shares repurchased value |  | $ 1,812,866 |  |  |  |  |  |

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