Net Loss Per Share - Schedule of Earnings Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Numerator: | ||
| Net loss, as reported | $ (1,199) | $ (1,075) |
| Less: net loss attributable to participating securities | 0 | 0 |
| Net loss available to common shareholders-basic and diluted | $ (1,199) | $ (1,075) |
| Weighted-average shares of common stock outstanding | 41,846,619 | 41,469,616 |
| Less: weighted-average shares of unvested restricted common stock outstanding | (1,840,830) | (1,993,177) |
| Weighted-average number of common shares used in computing basic and diluted net loss per common share | 40,005,789 | 39,476,439 |
| Net loss per share applicable to common shareholders-basic and diluted | $ (0.03) | $ (0.03) |