COMMITMENTS AND CONTINGENCIES - Sublease Income (Details) $ in Thousands	Mar. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
2016, (remaining nine months)	$ 263
2017	343
2018	127
Total future minimum sublease payments	733
New York, New York
Operating Leased Assets [Line Items]
2016, (remaining nine months)	121
2017	165
2018	127
Total future minimum sublease payments	413
Menlo Park, California
Operating Leased Assets [Line Items]
2016, (remaining nine months)	142
2017	178
2018	0
Total future minimum sublease payments	$ 320