Other Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Accrued Expenses
Accrued personnel costs	$ 12,101	$ 16,915
Accrued interest payable for convertible senior notes	3,900	5,903
Income tax payable	871	3,505
Accrued corporate legal fees and professional services	920	310
Accrued royalties	6,082	6,038
Accrued variable considerations	8,303	5,748
Purchase of API received not yet invoiced	79
Accrued expenses - other	5,426	3,809
Total	$ 37,682	$ 42,228