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Fair Value Measurement (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Fair Value [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Warrant liabilities at December 31, 2017 $ 858
Warrant liabilities at March 31, 2018 661
Quote Prices In Active Markets (Level 1) [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Warrant liabilities at December 31, 2017
Warrant liabilities at March 31, 2018
Significant Other Observable Inputs (Level 2) [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Warrant liabilities at December 31, 2017
Warrant liabilities at March 31, 2018
Significant Other Unobservable Inputs (Level 3) [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Warrant liabilities at December 31, 2017 858
Warrant liabilities at March 31, 2018 $ 661