Quarterly report pursuant to Section 13 or 15(d)

Warrant derivative liability - Private placement (Details)

v3.20.2
Warrant derivative liability - Private placement (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Jan. 08, 2019
Dec. 12, 2018
Dec. 31, 2018
Mar. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Jun. 24, 2020
Jun. 23, 2020
Jun. 01, 2020
Mar. 17, 2020
Warrants and Rights Note Disclosure [Abstract]                    
Units issued in private placement offering (in shares)   1,425,641                
Number of warrants included in each unit (in shares)   1                
Number of shares issuable per warrant (in shares)   0.50                
Unit price (in dollars per share)   $ 1.95                
Proceeds from offering   $ 2.8                
Share issuance costs   0.1                
Net proceeds from private placement offering $ 0.1 $ 2.7 $ 2.6              
Shares issued pursuant to a private placement (in shares) 25,641   1,400,000              
Warrants, exercise price (in dollars per share)             $ 4.25 $ 5.00    
Derivative liability         $ 0.2          
Shares issuable upon exercise of warrants (in shares)                 1,041,666  
December 2018 Warrants                    
Warrants and Rights Note Disclosure [Abstract]                    
Number of shares issuable per warrant (in shares)         570,258 1,990,624       1,003,232
Term of warrants   2 years                
Warrants, exercise price (in dollars per share)   $ 3.90     $ 0.65 $ 0.75       $ 1.62
Common Stock                    
Warrants and Rights Note Disclosure [Abstract]                    
Number of shares of stock included in each unit (in shares)   1                
Shares issued pursuant to a private placement (in shares)       308,642            
Shares issuable upon exercise of warrants (in shares)         4,276,937