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Share Repurchase Plan - Additional Information (Detail) - USD ($) |  |  |  | 1 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2016 | Aug. 31, 2016 | Jun. 20, 2016 | Jun. 30, 2015 | Aug. 31, 2016 | Aug. 31, 2015 | Oct. 06, 2016 | Nov. 30, 2015 | Apr. 08, 2015 | 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 |  |  |  |  |  |  |
Repurchase agreement, aggregate amount |  |  | $ 9,866,178 |  |  |  |  |  |  |  |
Repurchase agreement, aggregate amount |  |  | $ 8,000,000 |  |  |  |  |  |  |  |
Treasury stock, shares |  | 5,678,354 |  |  | 5,678,354 |  |  | 3,249,790 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to repurchase |  |  |  |  |  |  | 8,000,000 |  |  |  |
Number of shares repurchased | 17,900 |  |  |  |  |  |  |  |  |  |
Average price per share (repurchased) | $ 3.94 |  |  |  |  |  |  |  |  |  |
Ki Yong Choi [Member] |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  | 2,179,068 |  |  |  |  |  |  |  |
Average price per share (repurchased) |  |  | $ 4.50 |  |  |  |  |  |  |  |
Michael Cho [Member] |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  | 13,416 |  |  |  |  |  |  |  |
Average price per share (repurchased) |  |  | $ 4.50 |  |  |  |  |  |  |  |
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 | 2,429,033 | 957,956 |  |  |  |  |
Average price per share (repurchased) |  | $ 3.34 |  | $ 3.25 | $ 4.39 | $ 3.08 |  |  |  |  |
Share repurchase plan, shares repurchased value |  |  |  | $ 1,812,866 |  |  |  |  |  |  |
Treasury stock, shares |  | 5,678,354 |  |  | 5,678,354 |  |  |  |  |  |

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