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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (loss) | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance at the beginning at Dec. 31, 2021 | $ 109,700 | $ 4 | $ 252,464 | $ (119) | $ (142,649)
Balance at the beginning (in shares) at Dec. 31, 2021 |  | 35,034,000 |  |  |
Issuance of common stock under Equity Purchase Agreement, shares |  | 100,000 |  |  |
Issuance of common stock under Equity Purchase Agreement | 273 |  | 273 |  |
Repurchase of early exercised stock options | $ 0 |  |  |  |
Repurchase of early exercised stock options, shares |  | (8,000) |  |  |
Vesting of early exercised stock options | 30 |  | $ 30 |  |
Stock-based compensation expense | 916 |  | 916 |  |
Other comprehensive income | (310) |  |  | (310) |
Net loss | (7,947) |  |  |  | (7,947)
Balance at the end at Mar. 31, 2022 | 102,662 | $ 4 | 253,683 | (429) | (150,596)
Balance at the end (in shares) at Mar. 31, 2022 |  | 35,126,000 |  |  |
Balance at the beginning at Dec. 31, 2021 | 109,700 | $ 4 | 252,464 | (119) | (142,649)
Balance at the beginning (in shares) at Dec. 31, 2021 |  | 35,034,000 |  |  |
Issuance of common stock under Equity Purchase Agreement | 273 |  |  |  |
Repurchase of early exercised stock options | 16 |  |  |  |
Net loss | (35,229) |  |  |  |
Balance at the end at Sep. 30, 2022 | 77,491 | $ 4 | 255,789 | (424) | (177,878)
Balance at the end (in shares) at Sep. 30, 2022 |  | 35,123,000 |  |  |
Balance at the beginning at Mar. 31, 2022 | 102,662 | $ 4 | 253,683 | (429) | (150,596)
Balance at the beginning (in shares) at Mar. 31, 2022 |  | 35,126,000 |  |  |
Repurchase of early exercised stock options, shares |  | (2,000) |  |  |
Vesting of early exercised stock options | 27 |  | 27 |  |
Stock-based compensation expense | 979 |  | 979 |  |
Other comprehensive income | 47 |  |  | (47) |
Net loss | (13,925) |  |  |  | (13,925)
Balance at the end at Jun. 30, 2022 | 89,696 | $ 4 | 254,689 | (476) | (164,521)
Balance at the end (in shares) at Jun. 30, 2022 |  | 35,124,000 |  |  |
Repurchase of early exercised stock options, shares |  | (1,000) |  |  |
Vesting of early exercised stock options | 23 |  | 23 |  |
Stock-based compensation expense | 1,077 |  | 1,077 |  |
Other comprehensive income | 52 |  |  | 52 |
Net loss | (13,357) |  |  |  | (13,357)
Balance at the end at Sep. 30, 2022 | 77,491 | $ 4 | 255,789 | (424) | (177,878)
Balance at the end (in shares) at Sep. 30, 2022 |  | 35,123,000 |  |  |
Balance at the beginning at Dec. 31, 2022 | 76,001 | $ 3 | 254,892 | (241) | (178,653)
Balance at the beginning (in shares) at Dec. 31, 2022 |  | 30,088,000 |  |  |
Repurchase of early exercised stock options, shares |  | (9,000) |  |  |
Vesting of early exercised stock options | 13 |  | 13 |  |
Stock-based compensation expense | 1,129 |  | 1,129 |  |
Other comprehensive income | 191 |  |  | 191 |
Net loss | (14,297) |  |  |  | (14,297)
Balance at the end at Mar. 31, 2023 | 63,037 | $ 3 | 256,034 | (50) | (192,950)
Balance at the end (in shares) at Mar. 31, 2023 |  | 30,079,000 |  |  |
Balance at the beginning at Dec. 31, 2022 | 76,001 | $ 3 | 254,892 | (241) | (178,653)
Balance at the beginning (in shares) at Dec. 31, 2022 |  | 30,088,000 |  |  |
Issuance of common stock under Equity Purchase Agreement | $ 0 |  |  |  |
Issuance of common stock upon option exercises, shares | 6,000 |  |  |  |
Repurchase of early exercised stock options | $ 55 |  |  |  |
Net loss | (34,129) |  |  |  |
Balance at the end at Sep. 30, 2023 | 45,531 | $ 3 | 258,309 | 1 | (212,782)
Balance at the end (in shares) at Sep. 30, 2023 |  | 30,575,000 |  |  |
Balance at the beginning at Mar. 31, 2023 | 63,037 | $ 3 | 256,034 | (50) | (192,950)
Balance at the beginning (in shares) at Mar. 31, 2023 |  | 30,079,000 |  |  |
Issuance of common stock under employee stock purchase plan | 187 |  | 187 |  |
Repurchase of early exercised stock options, shares |  | 492,000 |  |  |
Vesting of early exercised stock options | 8 |  | 8 |  |
Stock-based compensation expense | 1,158 |  | 1,158 |  |
Other comprehensive income | 55 |  |  | 55 |
Net loss | (9,387) |  |  |  | (9,387)
Balance at the end at Jun. 30, 2023 | 55,058 | $ 3 | 257,387 | 5 | (202,337)
Balance at the end (in shares) at Jun. 30, 2023 |  | 30,571,000 |  |  |
Issuance of common stock upon option exercises | 3 |  | 3 |  |
Issuance of common stock upon option exercises, shares |  | 6,000 |  |  |
Repurchase of early exercised stock options, shares |  | (2,000) |  |  |
Vesting of early exercised stock options | 6 |  | 6 |  |
Stock-based compensation expense | 913 |  | 913 |  |
Other comprehensive income | (4) |  |  | (4) | 0
Net loss | (10,445) |  |  |  | (10,445)
Balance at the end at Sep. 30, 2023 | $ 45,531 | $ 3 | $ 258,309 | $ 1 | $ (212,782)
Balance at the end (in shares) at Sep. 30, 2023 |  | 30,575,000 |  |  |

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