Accrued Expenses -Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Royalties due to third parties	$ 11,811	$ 9,006
Rebates and other sales deductions	10,173	7,803
Selling and marketing	1,472	1,905
Research and development	1,280	2,186
Professional fees, consulting, and other services	1,067	1,081
Other expenses	850	746
Milestone payment		100,000
Accrued expenses	$ 26,653	$ 122,727

Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant