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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.

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Represents the percentage of economic interest in any future payments made under the agreements.

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

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Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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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.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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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.

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REVENUE RECOGNITION AND COLLABORATIVE ARRANGEMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
Revenue Recognition and Collaborative Arrangements
Total net revenue	$ 336,794	$ 261,016	$ 261,004
Strategic alliance - MABA program
Revenue Recognition and Collaborative Arrangements
Revenue recognized upon termination of contract	10,000
Royalty revenue from a related party
Revenue Recognition and Collaborative Arrangements
Total net revenue	326,794	261,016	261,004
Revenue from collaborative arrangements with a related party
Revenue Recognition and Collaborative Arrangements
Total net revenue	10,000	0	0
GSK
Revenue Recognition and Collaborative Arrangements
Total net revenue	336,794	261,016	261,004
Milestone fees paid	$ 220,000	220,000
GSK \| Long-Acting Beta2 Agonist (LABA) Collaboration
Revenue Recognition and Collaborative Arrangements
Milestone fees paid				$ 220,000
Percentage of economic interest in any future payments made under the agreements	15.00%
GSK \| Royalty revenue from a related party
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	$ 340,617	274,839	274,827
Less: amortization of capitalized fees paid to a related party	(13,823)	(13,823)	(13,823)
Total net revenue	326,794	261,016	261,004
GSK \| RELVAR/BREO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	$ 221,536	189,424	220,162
GSK \| RELVAR/BREO \| Long-Acting Beta2 Agonist (LABA) Collaboration
Revenue Recognition and Collaborative Arrangements
Royalty rate for first level of annual global net sales (as a percent)	15.00%
Annual global sales level used to determine royalty rate	$ 3,000,000
Royalty rate for sales above first level of annual global net sales (as a percent)	5.00%
GSK \| ANORO
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	$ 45,992	42,625	41,286
GSK \| ANORO \| Long-Acting Beta2 Agonist (LABA) Collaboration \| Minimum
Revenue Recognition and Collaborative Arrangements
Royalty rate for combination products (as a percent)	6.50%
GSK \| ANORO \| Long-Acting Beta2 Agonist (LABA) Collaboration \| Maximum
Revenue Recognition and Collaborative Arrangements
Royalty rate for combination products (as a percent)	10.00%
GSK \| TRELEGY
Revenue Recognition and Collaborative Arrangements
Royalties from a related party	$ 73,089	42,790	13,379
GSK \| TRELEGY \| Long-Acting Beta2 Agonist (LABA) Collaboration \| Minimum
Revenue Recognition and Collaborative Arrangements
Royalty rate for combination products (as a percent)	6.50%
GSK \| TRELEGY \| Long-Acting Beta2 Agonist (LABA) Collaboration \| Maximum
Revenue Recognition and Collaborative Arrangements
Royalty rate for combination products (as a percent)	10.00%
GSK \| Revenue from collaborative arrangements with a related party \| Strategic alliance - MABA program
Revenue Recognition and Collaborative Arrangements
Total net revenue	$ 10,000	$ 0	$ 0