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STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) (UNAUDITED) - USD ($)
$ in Thousands
Total
Common Stock
Voting Common Stock
Common Stock
Non-voting Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance at Dec. 31, 2020 $ 212,183 $ 3 $ 1 $ 319,605   $ (107,426)
Beginning balance (shares) at Dec. 31, 2020   32,595,301 11,110,371      
Exercise of stock options 386     386    
Exercise of stock options (shares)   210,274        
Sale of common stock, net of offering costs 161,412 $ 1   161,411    
Sale of common stock, net of offering costs, (shares)   2,583,334 291,666      
Stock-based compensation expense 3,886     3,886    
Net loss (21,300)         (21,300)
Ending balance at Mar. 31, 2021 356,567 $ 4 $ 1 485,288   (128,726)
Ending balance (shares) at Mar. 31, 2021   35,388,909 11,402,037      
Beginning balance at Dec. 31, 2021 285,897 $ 4 $ 1 505,723 $ (711) (219,120)
Beginning balance (shares) at Dec. 31, 2021   36,200,299 11,402,037      
Exercise of stock options $ 153     153    
Exercise of stock options (shares) 93,032 93,032        
Unrealized loss on marketable securities, net of tax $ (1,602)       (1,602)  
Stock-based compensation expense 6,829     6,829    
Net loss (29,465)         (29,465)
Ending balance at Mar. 31, 2022 $ 261,812 $ 4 $ 1 $ 512,705 $ (2,313) $ (248,585)
Ending balance (shares) at Mar. 31, 2022   36,293,331 11,402,037