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Stockholders' Equity (Additional Information) (Details) (USD $)
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0 Months Ended | 9 Months Ended | |
|---|---|---|---|
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Jul. 10, 2014
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Sep. 30, 2014
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Sep. 30, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Proceeds from issuance of common stock, net of issuance costs | $ 23,400,000 | $ 23,439,000 | $ 19,973,000 |
| Aggregate intrinsic value of options exercised | 2,700,000 | 44,000 | |
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Stock Options
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Compensation costs not yet recognized | 13,400,000 | ||
| Period for recognizing costs | 3 years 1 month 6 days | ||
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IPO | Common Stock
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock issued (in shares) | 4,200,000 | ||
| Gross proceeds from stock offering | $ 25,200,000 | ||