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Stockholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
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0 Months Ended |
1 Months Ended |
12 Months Ended |
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Mar. 15, 2012
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Aug. 31, 2013
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Jun. 30, 2011
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Jul. 13, 2011
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| Stockholder Equity [Line Items] |
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| Issue of common stock |
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$ 70,000 |
$ 591 |
$ 509 |
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| Commission rate |
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2.00% |
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| Common stock were issued and sales at market price |
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70,000 |
| Average price per share |
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$ 1.85 |
$ 4.08 |
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| Net proceeds under the agreement |
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5,218 |
17,805 |
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| Selling of company aggregate shares of common stock |
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|
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59,092 |
50,893 |
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| Public offering of common stock |
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4,600 |
|
7,547 |
4,774 |
437 |
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| Public offering of common stock, per share price |
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$ 4.40 |
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| Underwriters' over-allotment allocation on public offering |
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600 |
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| Expected net proceeds from common stock |
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18,500 |
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| Incentive earned |
1,542 |
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| Taxes paid |
$ 535 |
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| Common stock price |
$ 5.23 |
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ATM Agreement [Member]
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| Stockholder Equity [Line Items] |
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| Selling of company aggregate shares of common stock |
|
|
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2,883 |
4,516 |
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Restricted Common Stock [Member]
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| Stockholder Equity [Line Items] |
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| Restricted common stock in shares |
193 |
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