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CONDENSED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2022 | $ 17 | $ 1,368,979 | $ (153) | $ (1,382,459) | $ (13,616)
Balance (in shares) at Dec. 31, 2022 | 17,339,816 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  | (13,536) | (13,536)
Net change in 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) | 95 |  |  |  |
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) | 26,625 |  |  |  |
Stock-based compensation expense |  | 2,768 |  |  | 2,768
Balance at Mar. 31, 2023 | $ 17 | 1,371,748 | (27) | (1,395,995) | (24,257)
Balance (in shares) at Mar. 31, 2023 | 17,366,536 |  |  |  |
Balance at Dec. 31, 2022 | $ 17 | 1,368,979 | (153) | (1,382,459) | (13,616)
Balance (in shares) at Dec. 31, 2022 | 17,339,816 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  |  | (20,136)
Net change in unrealized gain (loss) on short-term investments |  |  |  |  | 128
Balance at Jun. 30, 2023 | $ 17 | 1,374,488 | (25) | (1,402,595) | (28,115)
Balance (in shares) at Jun. 30, 2023 | 17,435,790 |  |  |  |
Balance at Mar. 31, 2023 | $ 17 | 1,371,748 | (27) | (1,395,995) | (24,257)
Balance (in shares) at Mar. 31, 2023 | 17,366,536 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  | (6,600) | (6,600)
Net change in unrealized gain (loss) on short-term investments |  |  | 2 |  | 2
Issuance of common stock upon exercise of options |  | 554 |  |  | 554
Issuance of common stock upon exercise of options (in shares) | 52,379 |  |  |  |
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) | 16,875 |  |  |  |
Stock-based compensation expense |  | 2,186 |  |  | 2,186
Balance at Jun. 30, 2023 | $ 17 | 1,374,488 | (25) | (1,402,595) | (28,115)
Balance (in shares) at Jun. 30, 2023 | 17,435,790 |  |  |  |
Balance at Dec. 31, 2023 | $ 17 | 1,378,881 | 8 | (1,407,550) | (28,644)
Balance (in shares) at Dec. 31, 2023 | 17,482,513 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  | (8,247) | (8,247)
Net change in unrealized gain (loss) on short-term investments |  |  | (13) |  | (13)
Issuance of common stock upon exercise of options |  | 89 |  |  | 89
Issuance of common stock upon exercise of options (in shares) | 9,066 |  |  |  |
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) | 48,658 |  |  |  |
Stock-based compensation expense |  | 5,144 |  |  | 5,144
Balance at Mar. 31, 2024 | $ 17 | 1,384,114 | (5) | (1,415,797) | (31,671)
Balance (in shares) at Mar. 31, 2024 | 17,540,237 |  |  |  |
Balance at Dec. 31, 2023 | $ 17 | 1,378,881 | 8 | (1,407,550) | (28,644)
Balance (in shares) at Dec. 31, 2023 | 17,482,513 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  |  | (9,277)
Net change in unrealized gain (loss) on short-term investments |  |  |  |  | (17)
Balance at Jun. 30, 2024 | $ 17 | 1,386,905 | (9) | (1,416,827) | (29,914)
Balance (in shares) at Jun. 30, 2024 | 17,594,117 |  |  |  |
Balance at Mar. 31, 2024 | $ 17 | 1,384,114 | (5) | (1,415,797) | (31,671)
Balance (in shares) at Mar. 31, 2024 | 17,540,237 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  | (1,030) | (1,030)
Net change in unrealized gain (loss) on short-term investments |  |  | (4) |  | (4)
Issuance of common stock upon exercise of options |  | 252 |  |  | 252
Issuance of common stock upon exercise of options (in shares) | 36,130 |  |  |  |
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares) | 17,750 |  |  |  |
Stock-based compensation expense |  | 2,539 |  |  | 2,539
Balance at Jun. 30, 2024 | $ 17 | $ 1,386,905 | $ (9) | $ (1,416,827) | $ (29,914)
Balance (in shares) at Jun. 30, 2024 | 17,594,117 |  |  |  |

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