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Supplemental Information - Summary of Certain Statements of Operations Amounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expenses $ 4,971 $ 9,175 $ 4,385
Depreciation and amortization expenses 1,869 1,607 1,081
Research and Development [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expenses 1,132 2,190 629
Selling and Supply Chain [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expenses (461) 767 408
General and Administrative Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expenses $ 4,300 $ 6,218 $ 3,348