Quarterly report pursuant to Section 13 or 15(d)

CONDENSED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY

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CONDENSED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Total
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       (27,445) (27,445)
Net unrealized gain (loss) on short-term investments     (314)   (314)
Issuance of common stock upon exercise of options   940     940
Issuance of common stock upon exercise of options (in shares) 420,521        
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) 22,500        
Stock-based compensation expense   3,243     3,243
Balance at Mar. 31, 2022 $ 172 1,358,373 (416) (1,351,331) 6,798
Balance (in shares) at Mar. 31, 2022 172,045,247        
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         (59,974)
Net unrealized gain (loss) on short-term investments         (184)
Balance at Sep. 30, 2022 $ 173 1,364,139 (286) (1,383,860) (19,834)
Balance (in shares) at Sep. 30, 2022 172,836,336        
Balance at Mar. 31, 2022 $ 172 1,358,373 (416) (1,351,331) 6,798
Balance (in shares) at Mar. 31, 2022 172,045,247        
Increase (Decrease) in Stockholders' Equity          
Net loss       (13,492) (13,492)
Net unrealized gain (loss) on short-term investments     (22)   (22)
Issuance of common stock upon exercise of options $ 1 598     599
Issuance of common stock upon exercise of options (in shares) 609,839        
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) 181,250        
Stock-based compensation expense   2,440     2,440
Balance at Jun. 30, 2022 $ 173 1,361,411 (438) (1,364,823) (3,677)
Balance (in shares) at Jun. 30, 2022 172,836,336        
Increase (Decrease) in Stockholders' Equity          
Net loss       (19,037) (19,037)
Net unrealized gain (loss) on short-term investments     152   152
Stock-based compensation expense   2,728     2,728
Balance at Sep. 30, 2022 $ 173 1,364,139 (286) (1,383,860) (19,834)
Balance (in shares) at Sep. 30, 2022 172,836,336        
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       (13,536) (13,536)
Net unrealized gain (loss) on short-term investments     126   126
Issuance of common stock upon exercise of options   1     1
Issuance of common stock upon exercise of options (in shares) 952        
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) 266,256        
Stock-based compensation expense   2,768     2,768
Balance at Mar. 31, 2023 $ 174 1,371,591 (27) (1,395,995) (24,257)
Balance (in shares) at Mar. 31, 2023 173,665,853        
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         (25,828)
Net unrealized gain (loss) on short-term investments         138
Balance at Sep. 30, 2023 $ 175 1,376,293 (15) (1,408,287) (31,834)
Balance (in shares) at Sep. 30, 2023 174,367,228        
Balance at Mar. 31, 2023 $ 174 1,371,591 (27) (1,395,995) (24,257)
Balance (in shares) at Mar. 31, 2023 173,665,853        
Increase (Decrease) in Stockholders' Equity          
Net loss       (6,600) (6,600)
Net unrealized gain (loss) on short-term investments     2   2
Issuance of common stock upon exercise of options $ 1 553     554
Issuance of common stock upon exercise of options (in shares) 523,795        
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) 168,750        
Stock-based compensation expense   2,186     2,186
Balance at Jun. 30, 2023 $ 175 1,374,330 (25) (1,402,595) (28,115)
Balance (in shares) at Jun. 30, 2023 174,358,398        
Increase (Decrease) in Stockholders' Equity          
Net loss       (5,692) (5,692)
Net unrealized gain (loss) on short-term investments     10   10
Issuance of common stock upon exercise of options   8     8
Issuance of common stock upon exercise of options (in shares) 8,830        
Stock-based compensation expense   1,955     1,955
Balance at Sep. 30, 2023 $ 175 $ 1,376,293 $ (15) $ (1,408,287) $ (31,834)
Balance (in shares) at Sep. 30, 2023 174,367,228