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Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | $ 9,349 | $ 6,290 | $ 15,519 | $ 11,089
Inventory |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 489 |  | 1,061 |
Research and Development |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 1,976 | 2,674 | 4,156 | 4,862
Selling, General and Administrative |  |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |  |
Stock-based compensation expense | 2,470 | 2,997 | 5,550 | 5,585
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 | $ 292 | $ 619 | $ 630 | $ 642

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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