Revenue Recognition and Collaborative Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue Recognition and Collaborative Arrangements
Total net revenue from GSK	$ 65,755	$ 61,680	$ 185,045	$ 181,146
GSK
Revenue Recognition and Collaborative Arrangements
Total net revenue from GSK	65,755	61,680	185,045	181,146
GSK \| Royalty revenue from a related party
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	69,211	65,136	195,413	191,514
Less: amortization of capitalized fees paid to a related party	(3,456)	(3,456)	(10,368)	(10,368)
GSK \| RELVAR/BREO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	46,433	51,745	136,259	155,420
GSK \| ANORO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	11,548	9,769	30,753	29,149
GSK \| TRELEGY
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	$ 11,230	$ 3,622	$ 28,401	$ 6,945

Gross Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer before amortization of capitalized fees.

No definition available.

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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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.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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