COMMITMENTS AND CONTINGENCIES - Sublease Income (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Operating Leased Assets [Line Items]
2016, (remaining six months)	$ 176
2017	343
2018	127
Total future minimum sublease payments	646
New York, New York
Operating Leased Assets [Line Items]
2016, (remaining six months)	81
2017	165
2018	127
Total future minimum sublease payments	373
Menlo Park, California
Operating Leased Assets [Line Items]
2016, (remaining six months)	95
2017	178
2018	0
Total future minimum sublease payments	$ 273