Equity-based Compensation and Equity Incentive Plans - Schedule of Equity-based Compensation Expenses (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Equity-based compensation expense | $ 1,069 | $ 1,031 | $ 3,094 | $ 3,445 |
Research and Development Expense | ||||
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Equity-based compensation expense | 353 | 386 | 986 | 1,115 |
General and Administrative Expense | ||||
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Equity-based compensation expense | $ 716 | $ 645 | $ 2,108 | $ 2,330 |