Annual report pursuant to Section 13 and 15(d)

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

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Condensed Financial Statements - Summary of Certain Statements of Operations Amounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock compensation expense $ 9,175 $ 4,385 $ 12,092
Depreciation and amortization expenses 1,607 1,081 551
Research and Development [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock compensation expense 2,190 629 6,086
Selling and Supply Chain [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock compensation expense 767 408 529
General and Administrative [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock compensation expense $ 6,218 $ 3,348 $ 5,477