Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Stock Warrants - Estimated fair value of the warrant liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 $ (783) 0 $ (3,438) (4,083)
Ending Balance $ 0   $ 0   $ 0