ACCRUED EXPENSES - Schedule (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accrued liabilities
Accrued professional fees	$ 5,987	$ 6,258
Accrued marketing fees	2,633	4,852
Accrued revenue reserves	4,348	3,783
Accrued royalties	5,151	2,996
Accrued employee-related expenses	3,148	9,153
Accrued interest	6,700	4,715
Other accrued liabilities	949	384
Total accrued expenses	$ 28,916	$ 32,141