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Product Revenue, Net - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 2,526,000	$ 1,313,000	$ 2,994,000	$ 7,895,000
Contract with customer product sales gross to net accruals		0		0
Gross product revenue | Customer | Cardinal Health
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	22.70%		21.70%
Gross product revenue | Customer | AmerisourceBergen Drug Corporation
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	40.20%		35.10%
Gross product revenue | Customer | McKesson Corporation
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	24.60%		22.50%
IBSRELA
Disaggregation of Revenue [Line Items]
Revenue	$ 1,600,000		$ 2,000,000
Product sales, net
Disaggregation of Revenue [Line Items]
Revenue	$ 1,564,000	$ 0	$ 2,014,000	$ 0

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