Accounts Receivable, Sales and Allowances - Trade accounts receivable, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total trade accounts receivable, net	$ 43,914	$ 56,424
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Invoice payment due period	30 days
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Invoice payment due period	60 days
Chargebacks
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves	$ (14,624)	(38,861)
Commercial rebates
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves	(13,579)	(49,232)
Discounts and allowances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves	(1,591)	(3,510)
Doubtful accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves	(138)	(194)
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross trade accounts receivable	70,958	146,420
Royalty accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross trade accounts receivable	702	239
Other receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross trade accounts receivable	$ 2,186	$ 1,562