Quarterly report pursuant to Section 13 or 15(d)

Condensed Financial Statements - Summary of Certain Statements of Operations Amounts (Detail)

v3.20.2
Condensed Financial Statements - Summary of Certain Statements of Operations Amounts (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense $ 1,797 $ 2,304 $ 3,068 $ 3,860
Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense 488 539 807 779
Selling and Supply Chain [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense 151 165 (100) 228
General and Administrative Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense $ 1,158 $ 1,600 $ 2,361 $ 2,853