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Common stock - Public Offering of Common Stock (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 25, 2020
USD ($)
shares
Jun. 22, 2020
$ / shares
shares
Jul. 11, 2019
USD ($)
$ / shares
shares
Jul. 10, 2019
USD ($)
shares
Feb. 05, 2019
$ / shares
shares
Sep. 07, 2018
USD ($)
Sep. 30, 2020
shares
Mar. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
item
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
shares
Common stock issued         7,557,142            
Price per share (in dollars per share) | $ / shares         $ 1.75            
Proceeds from the issuance of common stock | $               $ 12,122      
Proceeds From Issuance Of Common Stock Net Of Issuance Costs | $                   $ 999  
Number of Vote on Common Shares | item                 1    
Dividends, Common Stock | $                 $ 0    
June 2020 Warrants                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 0.001                  
Exercise price of warrant | $ / shares   $ 0.001                  
Warrant to purchase shares of common stock   2,250,000                  
February 2019 [Member]                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares         1.95            
Exercise price of warrant | $ / shares         $ 1.95            
Common Stock | June 2020 Warrants                      
Common stock issued   20,250,000                  
Issue price | $ / shares   $ 2.00                  
Net proceeds from issuance of common stock | $ $ 48,276                    
Distribution Agreement [Member]                      
Common stock issued                 0   1,033,147
Commons Stock Value Maximum Right To Sell | $           $ 30,000          
Proceeds From Issuance Of Common Stock From Atm Sales | $                     $ 1,923
Lincoln Park Purchase Agreements [Member]                      
Common stock issued     571,429       0   0    
Price per share (in dollars per share) | $ / shares     $ 1.75                
Commons Stock Value Maximum Right To Sell | $       $ 20,000              
Stock Issued During Period, Shares, Issued for Services       330,000              
Proceeds From Issuance Of Common Stock Net Of Issuance Costs | $     $ 1,000 $ 0              
Underwriters' exercise                      
Shares issued         985,714            
Underwriters' exercise | Common Stock | June 2020 Warrants                      
Common stock issued 3,375,000                    
Common Stock | June 2020 Warrants                      
Common stock issued   20,250,000