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Fair Value Measurement (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability at December 31, 2016	$ 3,316
Reclassification of warrants from liabilities to equity per ASU 2017-11	(2,611)
Revised warrant liability at December 31, 2016	705
Warrant liability at December 31, 2017	858
Quote Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability at December 31, 2016
Reclassification of warrants from liabilities to equity per ASU 2017-11
Revised warrant liability at December 31, 2016
Warrant liability at December 31, 2017
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability at December 31, 2016
Reclassification of warrants from liabilities to equity per ASU 2017-11
Revised warrant liability at December 31, 2016
Warrant liability at December 31, 2017
Significant Other Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability at December 31, 2016	3,316
Reclassification of warrants from liabilities to equity per ASU 2017-11	(2,611)
Revised warrant liability at December 31, 2016	705
Warrant liability at December 31, 2017	$ 858