Revenue Recognition and Collaborative Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Revenue Recognition and Collaborative Arrangements
Total net revenue from GSK	$ 55,183	$ 52,380
GSK
Revenue Recognition and Collaborative Arrangements
Total net revenue from GSK	55,183	52,380
GSK \| Royalty revenue from a related party
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	58,639	55,836
Less: amortization of capitalized fees paid to a related party	(3,456)	(3,456)
GSK \| RELVAR/BREO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	42,740	46,160
GSK \| ANORO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	8,570	8,724
GSK \| TRELEGY
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	$ 7,329	$ 952

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.

+ Details

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Balance Type:	credit
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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://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

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://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

Reference 2: 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 3: 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

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