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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-in Capital
Grantee Status - Employees
Additional Paid-in Capital
Grantee Status - Contractors or Consultants
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Grantee Status - Employees
Grantee Status - Contractors or Consultants
Total
Balance at Dec. 31, 2020 $ 140,733     $ 49,234 $ (162,140) $ 1,243     $ 29,070
Balance (in shares) at Dec. 31, 2020 26,003                
Stock options issued   $ 3,749 $ 266       $ 3,749 $ 266  
Exercise of stock options $ 68     (35)         33
Exercise of stock options (in shares) 11                
Net loss         (17,346)       (17,346)
Balance at Dec. 31, 2021 $ 140,801     53,214 (179,486) 1,243     15,772
Balance (in shares) at Dec. 31, 2021 26,014                
Stock options issued   $ 4,087 $ 133       $ 4,087 $ 133  
Exercise of stock options $ 1,790     (862)         928
Exercise of stock options (in shares) 273                
Restricted stock unit release       (216)         (216)
Restricted stock unit release (in shares) 74                
Warrants issued to Petrichor       441         441
Net loss         (23,714)       (23,714)
Balance at Dec. 31, 2022 $ 142,591     $ 56,797 $ (203,200) $ 1,243     $ (2,569)
Balance (in shares) at Dec. 31, 2022 26,361