STOCKHOLDERS' DEFICIT - Calculation of Carrying Value of Preferred Stock (Details) - USD ($) $ in Thousands	Mar. 09, 2015	Mar. 31, 2016	Dec. 31, 2015
Temporary Equity [Line Items]
Issuance date liquidation preference		$ 71,701	$ 69,702
Initial carrying value of PIPE Preferred Shares		65,088	62,918
Payments of Stock Issuance Costs	$ 4,000
PIPE Warrants
Temporary Equity [Line Items]
Payments of Stock Issuance Costs	200
Series A Preferred Stock
Temporary Equity [Line Items]
Issuance date liquidation preference	62,500	70,500
Initial carrying value of PIPE Preferred Shares	52,380	$ 65,088	$ 62,918
Payments of Stock Issuance Costs	3,800
Warrant Value | Series A Preferred Stock
Temporary Equity [Line Items]
Discount on issuance	(3,145)
Beneficial Conversion Feature | Series A Preferred Stock
Temporary Equity [Line Items]
Discount on issuance	(3,145)
Issuance Costs | Series A Preferred Stock
Temporary Equity [Line Items]
Discount on issuance	$ (3,830)