Quarterly report pursuant to Section 13 or 15(d)

Stock Purchase Warrants (Details 1)

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Stock Purchase Warrants (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Beginning Balance     $ 4,083  
Change in fair value of warrant liability $ (626) $ 5,092 (4,064) $ (2,157)
Ending Balance $ 19   $ 19