Revenue Recognition and Collaborative Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue Recognition and Collaborative Arrangements
Total net revenue from GSK	$ 64,107	$ 67,086	$ 119,290	$ 119,466
GSK
Revenue Recognition and Collaborative Arrangements
Total net revenue from GSK	64,107	67,086	119,290	119,466
GSK \| Royalty revenue from a related party
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	67,563	70,542	126,202	126,378
Less: amortization of capitalized fees paid to a related party	(3,456)	(3,456)	(6,912)	(6,912)
GSK \| RELVAR/BREO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	47,086	57,515	89,826	103,675
GSK \| ANORO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	10,635	10,656	19,205	19,380
GSK \| TRELEGY
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	$ 9,842	$ 2,371	$ 17,171	$ 3,323

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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