Commitments and Contingencies - Sublease Income (Details)	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
2016	$ 348
2017	343
2018	127
Total	818
New York, New York
Loss Contingencies [Line Items]
2016	160
2017	165
2018	127
Total	452
Menlo Park, California
Loss Contingencies [Line Items]
2016	188
2017	178
2018	0
Total	$ 366