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Public Offerings - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2012 | Feb. 29, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Public Offerings [Abstract] |  |  |  |
Public offering of common stock per share amount | $ 6.10 | $ 5.61 |  |
Shares sold by company |  | 1,000,000 |  |
Number of shares sold by stockholders | 27,795,630 | 15,516,587 |  |
Proceeds after commissions and other direct selling expenses |  | $ 4,329 | $ 4,329 |
Sale of Stock, Consideration Received on Transaction | 0 |  |  |
Proceeds from Existing Shareholders on Sale | 0 |  |  |
Expenses related to offering |  |  | $ 353 | $ 729

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