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Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss Per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
|
Jun. 30, 2013
|
Jun. 30, 2014
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Jun. 30, 2013
|
|
| Earnings Per Share [Abstract] | ||||
| Net loss | $ (8,444) | $ (5,919) | $ (16,766) | $ (12,208) |
| Accretion of preferred stock issuance costs to redemption value | (117) | (234) | ||
| Accrued dividends on redeemable convertible preferred stock | (1,295) | (2,515) | ||
| Net loss attributable to common stockholders | $ (8,444) | $ (7,331) | $ (16,766) | $ (14,957) |
| Weighted-average number of common shares-basic and diluted | 16,464,410 | 2,210,766 | 16,444,210 | 2,190,479 |
| Net loss per share attributable to common stockholders-basic and diluted | $ (0.51) | $ (3.32) | $ (1.02) | $ (6.83) |