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Equity Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |
Stock-based compensation expense | $ 1,778 | $ 6,170
Research and Development |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |
Stock-based compensation expense | (1,573) | 2,180
Selling, General and Administrative |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |
Stock-based compensation expense | 2,442 | 3,080
Cost of Sales - Product |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |
Stock-based compensation expense | 136 | 572
Inventory |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |
Stock-based compensation expense | $ 773 | $ 338

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