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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Total
Balance at beginning at Dec. 31, 2018 $ 26 $ 213,453 $ (8) $ (106,848) $ 106,623
Balance at beginning (in shares) at Dec. 31, 2018 26,217,701        
Increase (decrease) in Stockholders' Equity          
Unrealized gain (loss) on marketable securities     45   45
Sale of common shares, net of issuance costs $ 4 48,344     48,348
Sale of common shares, net of issuance costs (in shares) 3,450,000        
Restricted shares forfeited during the period (in shares) (4,210)        
Exercise of stock options   913     913
Exercise of stock options (in shares) 129,431        
Equity-based compensation expense   7,972     7,972
Net Loss       (51,000) (51,000)
Balance at end at Dec. 31, 2019 $ 30 270,682 37 (157,848) 112,901
Balance at end (in shares) at Dec. 31, 2019 29,792,922        
Increase (decrease) in Stockholders' Equity          
Unrealized gain (loss) on marketable securities     (39)   (39)
Sale of common shares, net of issuance costs $ 4 215,918     215,922
Sale of common shares, net of issuance costs (in shares) 3,717,948        
Restricted shares forfeited during the period (in shares) (42,010)        
Exercise of stock options   7,294     7,294
Exercise of stock options (in shares) 676,649        
Equity-based compensation expense   11,175     11,175
Exercise of warrants (in shares) 6,961        
Net Loss       (86,483) (86,483)
Balance at end at Dec. 31, 2020 $ 34 $ 505,069 $ (2) $ (244,331) $ 260,770
Balance at end (in shares) at Dec. 31, 2020 34,152,470