Quarterly report pursuant to Section 13 or 15(d)

Stock Warrants - Estimated fair value of the warrant liability (Details)

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Stock Warrants - Estimated fair value of the warrant liability (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value of Financial Instruments          
Beginning Balance     $ 0 $ 4,083 $ 4,083
Change in fair value of warrant liability $ 0 $ (626) 0 $ (4,064) (4,083)
Ending Balance $ 0   $ 0   $ 0