Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Warrants (Details 5)

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Stock-Based Compensation and Warrants (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Beginning Balance $ 4,083 $ 14,821
Change in fair value of warrant liability (4,083) (10,738)
Ending Balance $ 0 $ 4,083