Quarterly report pursuant to Section 13 or 15(d)

Supplemental Information - Summary of Certain Statements of Operations Amounts (Detail)

v3.20.2
Supplemental Information - Summary of Certain Statements of Operations Amounts (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense $ 570 $ 2,705 $ 3,638 $ 6,565
Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense (84) 461 723 1,240
Selling and Supply Chain [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense (372) 263 (472) 491
General and Administrative Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense $ 1,026 $ 1,981 $ 3,387 $ 4,834