Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Stock-Based Compensation Expense Recognized (Details)

v3.20.1
Stock-Based Compensation - Stock-Based Compensation Expense Recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total stock-based compensation expense $ 4,007 $ 1,993 $ 203
Research and Development Expense      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total stock-based compensation expense 1,777 842 93
General and Administrative Expense      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total stock-based compensation expense $ 2,230 $ 1,151 $ 110