Annual report pursuant to Section 13 and 15(d)

STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY

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STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Total
Balance at Dec. 31, 2020 $ 169 $ 1,339,833 $ (4) $ (1,305,972) $ 34,026
Balance (in shares) at Dec. 31, 2020 169,316,782        
Increase (Decrease) in Stockholders' Equity          
Net loss       (17,914) (17,914)
Net change in unrealized gain (loss) on short-term investments     (98)   (98)
Issuance of common stock upon exercise of options $ 3 4,772     4,775
Issuance of common stock upon exercise of options (in shares) 2,285,444        
Stock-based compensation expense   9,585     9,585
Balance at Dec. 31, 2021 $ 172 1,354,190 (102) (1,323,886) 30,374
Balance (in shares) at Dec. 31, 2021 171,602,226        
Increase (Decrease) in Stockholders' Equity          
Net loss       (58,573) (58,573)
Net change in unrealized gain (loss) on short-term investments     (51)   (51)
Issuance of common stock upon exercise of options $ 2 2,122     2,124
Issuance of common stock upon exercise of options (in shares) 1,580,169        
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) 216,250        
Stock-based compensation expense   12,510     12,510
Balance at Dec. 31, 2022 $ 174 1,368,822 (153) (1,382,459) (13,616)
Balance (in shares) at Dec. 31, 2022 173,398,645        
Increase (Decrease) in Stockholders' Equity          
Net loss       (25,091) (25,091)
Net change in unrealized gain (loss) on short-term investments     161   161
Issuance of common stock upon exercise of options $ 1 1,048     1,049
Issuance of common stock upon exercise of options (in shares) 991,959        
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) 435,006        
Stock-based compensation expense   8,853     8,853
Balance at Dec. 31, 2023 $ 175 $ 1,378,723 $ 8 $ (1,407,550) $ (28,644)
Balance (in shares) at Dec. 31, 2023 174,825,610