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Summary of Disaggregation of Product Revenues from Contracts with Customers by Major Product Line (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 60,634 | $ 44,830
Product revenue, percentage change amount | 15,813 |
Royalty and other revenue, percentage change amount | (9) |
Total revenue, percentage change amount | $ 15,804 |
Product revenue, percentage change | 35.3 |
Royalty and other revenue, percentage change | (29.0) |
Total revenue, percentage change | 35.3 |
Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 60,612 | 44,799
Royalty and Other Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 22 | $ 31

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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