Balance Sheet Account Detail - Schedule of Amounts Presented in Accounts Payable and Other Accrued Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Commercial/Medicaid Rebates and Government Chargebacks
Accounts Payable And Other Accrued Liabilities [Roll Forward]
Beginning balance	$ 22,952	$ 21,480
Add: GTN accruals recorded for product sales	7,702	69,704
(Less): Payments made and credits against GTN accruals	(15,983)	(68,232)
Ending balance	14,671	22,952
Distribution, Data, Inventory, and GPO Administrative Fees
Accounts Payable And Other Accrued Liabilities [Roll Forward]
Beginning balance	3,932	5,727
Add: GTN accruals recorded for product sales	1,209	13,962
(Less): Payments made and credits against GTN accruals	(4,003)	(15,757)
Ending balance	1,138	3,932
Product Return Allowances
Accounts Payable And Other Accrued Liabilities [Roll Forward]
Beginning balance	5,171	4,045
Add: GTN accruals recorded for product sales	167	1,700
(Less): Payments made and credits against GTN accruals	(624)	(574)
Ending balance	$ 4,714	$ 5,171