Other Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Accrued Expenses
Accrued personnel costs	$ 9,770	$ 15,850
Accrued interest payable	299	2,096
Income tax payable	74	556
Accrued corporate legal fees and professional services	612	589
Accrued royalties	2,932
Accrued sales deductions	1,254
Accrued expenses - other	2,526	396
Other accrued expenses	$ 17,467	$ 19,487