Revenue Recognition and Collaborative Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue Recognition and Collaborative Arrangements
Total net revenue	$ 78,946	$ 64,107	$ 157,624	$ 119,290
Royalty revenue from a related party
Revenue Recognition and Collaborative Arrangements
Total net revenue	68,946	64,107	147,624	119,290
Revenue from collaborative arrangements with a related party
Revenue Recognition and Collaborative Arrangements
Total net revenue	10,000	0	10,000	0
GSK
Revenue Recognition and Collaborative Arrangements
Total net revenue	78,946	64,107	157,624	119,290
GSK \| Royalty revenue from a related party
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	72,402	67,563	154,536	126,202
Less: amortization of capitalized fees paid to a related party	(3,456)	(3,456)	(6,912)	(6,912)
Total net revenue	68,946	64,107	147,624	119,290
GSK \| RELVAR/BREO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	45,570	47,086	101,719	89,826
GSK \| ANORO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	11,199	10,635	21,049	19,205
GSK \| TRELEGY
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	15,633	9,842	31,768	17,171
GSK \| Revenue from collaborative arrangements with a related party \| Strategic alliance - MABA program
Revenue Recognition and Collaborative Arrangements
Total net revenue	$ 10,000	$ 0	$ 10,000	$ 0

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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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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