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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | $ 8,613 | $ 5,376 | $ 24,188 | $ 15,123
Research and Development |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 1,532 | 798 | 4,271 | 2,607
Selling, General and Administrative |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 6,019 | 3,930 | 17,043 | 10,519
Cost of Sales - Product |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 323 | 124 | 626 | 448
Inventory |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | $ 739 | $ 524 | $ 2,248 | $ 1,549

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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