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Company Operations by Product, Customer and Geographic Area - Revenue by Significant Customer (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Product sales	$ 0	$ 22,334,000	$ 59,215,000
McKesson Corporation
Segment Reporting Information [Line Items]
Product sales		5,758,000	14,900,000
Cardinal Health
Segment Reporting Information [Line Items]
Product sales		5,155,000	15,088,000
AmerisourceBergen
Segment Reporting Information [Line Items]
Product sales		3,155,000	12,059,000
QuVa Pharma
Segment Reporting Information [Line Items]
Product sales		3,117,000	3,252,000
Others
Segment Reporting Information [Line Items]
Product sales		$ 5,149,000	$ 13,916,000

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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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