The Company, Adoption of New Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Statement of Operations and Comprehensive Loss [Abstract]
Revenues	$ 6,466	$ 7,097
ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standard	(234)
Balances Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]
Statement of Operations and Comprehensive Loss [Abstract]
Revenues	6,496
Effect of Adoption Higher / (Lower) [Member] | ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue			$ 234
Statement of Operations and Comprehensive Loss [Abstract]
Revenues	(30)
Effect of Adoption Higher / (Lower) [Member] | ASU 2014-09 [Member] | Accumulated Deficit [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standard	$ (234)