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Equity Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 5,024 $ 4,088 $ 9,747 $ 5,866
Research and Development        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 937 774 1,809 (799)
Selling, General and Administrative        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 3,445 2,491 6,589 4,933
Cost of Sales - Product        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense 155 179 324 315
Inventory        
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]        
Stock-based compensation expense $ 487 $ 644 $ 1,025 $ 1,417