Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 9 Months Ended | |
---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |||
Aggregate intrinsic value of options exercised | $ 595 | $ 3,446 | |
Options Granted, Weighted-average grant-date fair value | $ 12.98 | $ 11.77 | |
Total fair value of restricted common stock vested | $ 28 | $ 44 | |
Unrecognized stock-based compensation expenses | $ 41,143 | $ 41,143 | |
Unrecognized stock-based compensation expense, period for recognition | 3 years 29 days | ||
Additional research and development expenses | $ 274 | $ 274 |