ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
Accounts payable	$ 2,370	$ 2,232
Accrued compensation	4,791	7,077
Accrued rebates and sales discounts	14,175	8,594
Allowance for product returns	11,817	10,278
Accrued contract sales organization fees	209	962
Inventory and other contract manufacturing accruals	285	87
Other accrued liabilities	10,627	5,705
Total accounts payable and accrued liabilities	$ 44,274	$ 34,935