Accrued Liabilities Accrued rebates, chargebacks and other reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Contract assets [Line Items]
Government rebates and chargebacks	$ 3,617	$ 8,901
Assistance and Other Discounts	1,005	3,457
Product return	3,876	4,681
Discount and Distribution Fees	1,345	3,094
Accrued liabilities, amounts received in advance of revenue recognition	9,843	$ 20,133
Allowances for prior period sales	2,086
Payments for current period sales	(17,118)
Allowances for current period sales	23,917
Payments for prior period sales	(19,175)
Discount and Distribution Fees [Member]
Contract assets [Line Items]
Allowances for prior period sales	50
Payments for current period sales	(3,813)
Allowances for current period sales	5,090
Payments for prior period sales	(3,076)
Government Rebates and Chargebacks [Member]
Contract assets [Line Items]
Allowances for prior period sales	1,848
Payments for current period sales	(8,843)
Allowances for current period sales	12,104
Payments for prior period sales	(10,393)
Assistance and Other Discounts [Member]
Contract assets [Line Items]
Allowances for prior period sales	142
Payments for current period sales	(4,186)
Allowances for current period sales	5,003
Payments for prior period sales	(3,411)
Product Returns [Member]
Contract assets [Line Items]
Allowances for prior period sales	46
Payments for current period sales	(276)
Allowances for current period sales	1,720
Payments for prior period sales	$ (2,295)