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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
IPO [Member]
Common Stock
Private Placement [Member]
Common Stock
Additional Paid-in Capital
IPO [Member]
Additional Paid-in Capital
Private Placement [Member]
Additional Paid-in Capital
Accumulated Deficit
IPO [Member]
Private Placement [Member]
Total
Balance at Dec. 31, 2018     $ 103     $ 565,372 $ (32,381)     $ 533,094
Balance (shares) at Dec. 31, 2018     102,649,701              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Exercise of stock options           822       822
Exercise of stock options (shares)     149,599              
Share-based compensation           1,816       1,816
Net loss             (21,351)     (21,351)
Balance at Sep. 30, 2019     $ 103     568,010 (53,732)     514,381
Balance (shares) at Sep. 30, 2019     102,799,300              
Balance at Jun. 30, 2019     $ 103     567,248 (49,062)     518,289
Balance (shares) at Jun. 30, 2019     102,769,324              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Exercise of stock options           164       164
Exercise of stock options (shares)     29,976              
Share-based compensation           598       598
Net loss             (4,670)     (4,670)
Balance at Sep. 30, 2019     $ 103     568,010 (53,732)     514,381
Balance (shares) at Sep. 30, 2019     102,799,300              
Balance at Dec. 31, 2019     $ 103     568,756 (64,981)     503,878
Balance (shares) at Dec. 31, 2019     102,843,612              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Issuance of common stock $ 14     $ 318,979 $ 2,233     $ 318,993 $ 2,233  
Issuance of common stock (shares) 13,500,000 85,880                
Exercise of stock options           185       185
Exercise of stock options (shares)     33,792              
Share-based compensation           3,903       3,903
Net loss             (13,806)     (13,806)
Balance at Sep. 30, 2020     $ 117     894,056 (78,787)     815,386
Balance (shares) at Sep. 30, 2020     116,463,284              
Balance at Jun. 30, 2020     $ 103     570,434 (73,694)     496,843
Balance (shares) at Jun. 30, 2020     102,862,404              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Issuance of common stock $ 14     $ 318,979 $ 2,233     $ 318,993 $ 2,233  
Issuance of common stock (shares) 13,500,000 85,880                
Exercise of stock options           82       82
Exercise of stock options (shares)     15,000              
Share-based compensation           2,328       2,328
Net loss             (5,093)     (5,093)
Balance at Sep. 30, 2020     $ 117     $ 894,056 $ (78,787)     $ 815,386
Balance (shares) at Sep. 30, 2020     116,463,284