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Organization Nature of Business and Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Operations [Line Items]      
Retained deficit $ (357,415)   $ (292,703)
Difference between Revenue Guidance in Effect before and after Topic 606      
Operations [Line Items]      
Retained deficit   $ 900