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Share Repurchase Plan - Additional Information (Detail) - USD ($) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Nov. 30, 2016 | Jun. 20, 2016 | Nov. 30, 2017 | Oct. 06, 2016 | Apr. 08, 2015 | Jun. 06, 2012 | Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to repurchase |  |  |  |  | 8,000,000 | 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 |  |  |  |
Repurchase agreement, aggregate amount |  |  | $ 9,866,178 |  |  |  |  |
Repurchase agreement, aggregate amount |  |  | $ 8,000,000 |  |  |  |  |
Treasury stock, shares | 5,801,086 | 5,714,868 |  | 5,801,086 |  |  |  |
Ki Yong Choi [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase agreement, number of shares to be repurchased |  |  | 2,179,068 |  |  |  |  |
Repurchase agreement, purchase price per share |  |  | $ 4.50 |  |  |  |  |
Michael Cho [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase agreement, number of shares to be repurchased |  |  | 13,416 |  |  |  |  |
Repurchase agreement, purchase price per share |  |  | $ 4.50 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase agreement, purchase price per share | $ 3.37 | $ 3.35 |  |  |  |  |  |
Treasury stock, shares | 5,801,086 | 5,714,171 |  | 5,801,086 |  |  |  |

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