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Leases - Components of Lease Expense included in Condensed Consolidated Statement of Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Lessor Lease Description [Line Items] |  |  |  |
Total operating lease expense | $ 548 | $ 796 | $ 1,321 | $ 1,615
Selling, General and Administrative Expenses [Member] |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |
Total operating lease expense | 271 | 349 | 598 | 698
Research and Development Expenses [Member] |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |
Total operating lease expense | 251 | 430 | 676 | 884
Cost of Sales [Member] |  |  |  |
Lessor Lease Description [Line Items] |  |  |  |
Total operating lease expense | $ 26 | $ 17 | $ 47 | $ 33

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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