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Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 02, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies (Textual)      
Right to use asset and liability $ 3,859 $ 290
Weighted average remaining lease term 4 years 9 months 29 days    
Operating lease liabilities, weighted average discount rate 6.50%