Quarterly report pursuant to Section 13 or 15(d)

Warrant derivative liability, Private placement (Details)

v3.20.1
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
Mar. 31, 2019
Mar. 17, 2020
Jan. 20, 2020
Private Placement Offering [Abstract]              
Units issued in private placement offering (in shares)   1,425,641          
Unit price (in dollars per share)   $ 1.95          
Gross proceeds from private placement offering   $ 2.8          
Share issuance costs   0.1          
Net proceeds from private placement offering   $ 2.7          
Cash payable if warrants settled in cash       $ 0.2      
Warrant [Member]              
Private Placement Offering [Abstract]              
Number of shares issuable per unit (in shares)   0.5       1,003,232  
Warrants, exercisable period       2 years      
Warrants, exercise price (in dollars per share)       $ 3.90   $ 1.62  
Common Stock [Member]              
Private Placement Offering [Abstract]              
Number of shares issuable per unit (in shares)   1         61,224
Net proceeds from private placement offering $ 0.1   $ 2.6        
Shares issued in private placement offering (in shares) 25,641   1,400,000 308,642 0    
Number of warrants issuable if settled (in shares)       1,716,055