SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition and Inventory (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Revenue recognized on an accrual basis	$ 24,510	$ 11,854	$ 57,592	$ 23,369
Revenue recognized when cash is received	3,605	778	6,543	1,648
Total	28,115	$ 12,632	64,135	$ 25,017
Inventory
Raw materials	2,242		2,242		$ 1,772
Semi-finished and finished goods	5,424		5,424		4,905
Total inventory	$ 7,666		$ 7,666		$ 6,677