Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued Liabilities Abstract
Accrued product returns	$ 33,457	$ 48,464
Accrued royalties	3,649	3,598
Accrued compensation	10,998	8,673
Accrued government and managed care rebates	4,867	9,981
Accrued research and development	3,028	8,338
Accrued expenses and other liabilities	8,477	7,363
Customer coupons	777	719
Deferred revenue		101
Accrued Liabilities	$ 65,253	$ 87,237