Stock-Based Compensation - Summary of Stock-based Compensation Expense Reflected in Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended |
---|---|---|
Sep. 30, 2019 |
Sep. 30, 2019 |
|
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
Stock-based compensation expense | $ 2,144 | $ 4,003 |
General and Administrative | ||
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
Stock-based compensation expense | 1,314 | 2,464 |
Research and Development | ||
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
Stock-based compensation expense | $ 830 | $ 1,539 |