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Equity Plans and Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Employees and directors stock-based compensation expense | $ 25,456 | $ 23,478 | $ 14,917
Inventory |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | 1,964 | 759 |
Research and Development |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | 8,058 | 9,604 | 7,827
Selling, General and Administrative |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | 10,224 | 11,761 | $ 7,090
Cost of Sales - Product |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | 1,088 | $ 1,354 |
Restructuring |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | $ 4,122 |  |

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