Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Stock-Based Compensation Expense (Detail)

v3.19.2
Stock Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 1,442 $ 922 $ 2,803 $ 1,565
Research and Development        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total stock-based compensation 583 316 1,035 496
General and Administrative        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 859 $ 606 $ 1,768 $ 1,069