INCOME TAXES - Schedule of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 0	$ 0	$ (466)
State	51	28	52
Foreign	667	160	(125)
Total current	718	188	(539)
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	144	151	(3)
Total deferred	144	151	(3)
Provisions for (benefit from) income taxes	$ 862	$ 339	$ (542)