Summary of Significant Accounting Policies (Details 10) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Accounts receivable and unbilled revenue, net	$ 1,982	$ 1,010
Liabilities
Deferred revenues	553	1,248
Equity
Accumulated deficit	(182,855)	$ (183,745)
Balances excluding revenue standard [Member]
Assets
Accounts receivable and unbilled revenue, net	893
Liabilities
Deferred revenues	817
Equity
Accumulated deficit	(184,208)
Impact of Revenue Standard [Member]
Assets
Accounts receivable and unbilled revenue, net	1,089
Liabilities
Deferred revenues	(264)
Equity
Accumulated deficit	$ 1,353