Quarterly report pursuant to Section 13 or 15(d)

Warrant derivative liability, Fair value of warrant derivative liability (Details)

v3.20.2
Warrant derivative liability, Fair value of warrant derivative liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Warrant Derivative Liability [Abstract]        
Balance, beginning of period $ 841 $ 2,220 $ 2,220  
Change in fair value of derivative liability 3,474 (1,379) 2,095 $ 193
Balance, end of period $ 4,315 $ 841 $ 4,315