COMMITMENTS AND CONTINGENCIES - Sublease Income (Details) $ in Thousands	Sep. 30, 2016 USD ($)
Operating Leased Assets [Line Items]
2016, (remaining three months)	$ 89
2017	343
2018	127
Total future minimum sublease payments	559
New York, New York
Operating Leased Assets [Line Items]
2016, (remaining three months)	41
2017	165
2018	127
Total future minimum sublease payments	333
Menlo Park, California
Operating Leased Assets [Line Items]
2016, (remaining three months)	48
2017	178
2018	0
Total future minimum sublease payments	$ 226