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Equity Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | $ 4,748 | $ 6,046 | $ 20,267 | $ 17,135
Inventory |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 620 | 295 | 1,681 | 295
Research and Development |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 1,661 | 2,332 | 5,817 | 7,194
Selling, General and Administrative |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 2,278 | 2,976 | 7,828 | 8,561
Restructuring |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense |  |  | 4,122 |
Cost of Sales - Product |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | $ 189 | $ 443 | $ 819 | $ 1,085

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