Revenue Recognition - Disaggregated Revenues by Timing of Transfer of Goods or Services (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	$ 6,644
Product Revenue, net
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	606
Collaboration and License Revenue
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	6,038
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	606
Transferred at a point in time \| Product Revenue, net
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	606
Transferred over time
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	6,038
Transferred over time \| Collaboration and License Revenue
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	$ 6,038

Amount, excluding 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration