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Additions and Returns of Product Rights - Narrative (Details) - USD ($) shares in Thousands	1 Months Ended			3 Months Ended	6 Months Ended		24 Months Ended
	Apr. 30, 2019	Nov. 30, 2018	Nov. 30, 2016	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Payment to acquire business upon closing					$ 0	$ 5,000,000
Clinigen
Business Acquisition [Line Items]
Revenue						5,300,000
Direct expenses						3,400,000
Discontinued operations income					1,500,000	$ 1,900,000
Inventory									$ 500,000
Clinigen \| Scenario, Forecast
Business Acquisition [Line Items]
Financial consideration received in exchange for product license rights							$ 5,000,000
Nordic
Business Acquisition [Line Items]
Revenue				$ 500,000
Vibativ
Business Acquisition [Line Items]
Payment to acquire business upon closing		$ 20,000,000.0			20,000,000
Cash payment during 2019	$ 5,000,000.0				5,000,000
Percentage of tiered royalty payments (up to)		20.00%
Additional liability				8,300,562	8,300,562				$ 8,633,589
Vibativ \| Other current liabilities
Business Acquisition [Line Items]
Additional liability				2,800,000	2,800,000
Vibativ \| Other long-term liabilities
Business Acquisition [Line Items]
Additional liability				$ 5,500,000	5,500,000
Methotrexate
Business Acquisition [Line Items]
Payment to acquire business upon closing			$ 100,000
Liability recorded			$ 900,000
Vested common stock, value					$ 900,000
Methotrexate \| Subsequent Event
Business Acquisition [Line Items]
Additional liability								$ 1,000,000.0
Methotrexate \| Restricted Stock
Business Acquisition [Line Items]
Unvested restricted shares (in shares)			180