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STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Preferred Stock
Additional Paid-in Capital
Accumulated Deficit
Total
Balance at Dec. 31, 2019 $ 1 $ 1 $ 51,490 $ (49,926) $ 1,566
Balance (in shares) at Dec. 31, 2019 8,877 105      
Common stock issued upon exercise of warrants and options on a cashless basis (in shares) 267        
Common stock issued upon exercise of warrants and options on a cash basis     1,264   1,264
Common stock issued upon exercise of warrants and options on a cash basis (in shares) 353        
Common stock issued upon settlement of restricted stock units (in shares) 117        
Common stock issued upon conversion of preferred stock (in shares) 43 (15)      
Issuance of common stock for cash, net of transaction expenses     7,824   7,824
Issuance of common stock for cash, net of transaction expenses (in shares) 473        
Stock-based compensation     4,138   4,138
Net loss       (7,158) (7,158)
Balance at Dec. 31, 2020 $ 1 $ 1 64,716 (57,084) 7,634
Balance (in shares) at Dec. 31, 2020 10,130 90      
Common stock issued upon exercise of warrants and options on a cashless basis (in shares) 156        
Common stock issued upon exercise of warrants and options on a cash basis     644   644
Common stock issued upon exercise of warrants and options on a cash basis (in shares) 126        
Common stock issued upon settlement of restricted stock units (in shares) 283        
Common stock issued upon conversion of preferred stock   $ (1) 1    
Common stock issued upon conversion of preferred stock (in shares) 279 (90)      
Issuance of common stock for cash, net of transaction expenses     16,534   16,534
Issuance of common stock for cash, net of transaction expenses (in shares) 472        
Stock-based compensation     7,616   7,616
Net loss       (14,209) (14,209)
Issuance of common stock for services (in shares) 32        
Surrender of stock to cover tax liability on settlement of employee stock-based awards     (622)   (622)
Surrender of stock to cover tax liability on settlement of employee stock-based awards (in share) (43)        
Balance at Dec. 31, 2021 $ 1   $ 88,889 $ (71,293) $ 17,597
Balance (in shares) at Dec. 31, 2021 11,435