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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | $ 4,088 | $ 9,349 | $ 5,866 | $ 15,519
Research and Development |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 774 | 1,976 | (799) | 4,156
Selling, General and Administrative |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 2,491 | 2,470 | 4,933 | 5,550
Restructuring |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense |  | 4,122 |  | 4,122
Cost of Sales - Product |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 179 | 292 | 315 | 630
Inventory |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | $ 644 | $ 489 | $ 1,417 | $ 1,061

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