ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
Accounts payable	$ 1,684	$ 1,278
Accrued compensation	6,950	7,248
Accrued rebates and sales discounts	56,585	20,695
Allowance for product returns	17,605	15,015
Inventory and other contract manufacturing accruals	3,012	360
Royalties payable	9,548	810
Sales and marketing accruals	6,625	2,497
Other accrued liabilities	11,916	4,783
Total accounts payable and accrued liabilities	$ 113,925	$ 52,686