Quarterly report pursuant to Section 13 or 15(d)

Nature of business and summary of significant accounting policies - Restricted Cash (Details)

v3.20.2
Nature of business and summary of significant accounting policies - Restricted Cash (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Restricted Cash [Abstract]      
Escrow funds - prepayment for preferred stock issuance $ 1,518 $ 0  
Credit card      
Restricted Cash [Abstract]      
Restricted cash (less than for 2020) $ 100   $ 200