Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Capital Leased Assets [Line Items]
Capital Leased Assets, Gross	$ 798	$ 798
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	(670)	(613)
Capital Leases, Balance Sheet, Assets by Major Class, Net	128	185
Computer and network equipment
Capital Leased Assets [Line Items]
Capital Leased Assets, Gross	511	511
Furniture
Capital Leased Assets [Line Items]
Capital Leased Assets, Gross	$ 287	$ 287