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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