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CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2022 |  | 198,575,016 |  |  |
Beginning balance at Dec. 31, 2022 | $ 98,329 | $ 20 | $ 878,500 | $ (780,137) | $ (54)
Ending balance (in shares) at Mar. 31, 2023 |  | 214,462,050 |  |  |
Ending balance at Mar. 31, 2023 | 125,421 | $ 21 | 932,330 | (806,910) | (20)
Beginning balance (in shares) at Dec. 31, 2022 |  | 198,575,016 |  |  |
Beginning balance at Dec. 31, 2022 | 98,329 | $ 20 | 878,500 | (780,137) | (54)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 165,969 |  |  |
Issuance of common stock under employee stock purchase plan | 138 |  | 138 |  |
Issuance of common stock for services (in shares) |  | 86,095 |  |  |
Issuance of common stock for services | 337 |  | 337 |  |
Issuance of common stock upon exercise of options (in shares) |  | 98,994 |  |  |
Issuance of common stock upon exercise of options | 211 |  | 211 |  |
Issuance of common stock upon vesting of restricted stock units (in shares) |  | 423,074 |  |  |
Issuance of common stock in at the market offering (in shares) |  | 18,513,773 |  |  |
Issuance of common stock in at the market offering | 62,085 | $ 2 | 62,083 |  |
Stock-based compensation | 6,111 |  | 6,111 |  |
Unrealized losses on available-for-sale securities | (156) |  |  |  | (156)
Net loss | (43,894) |  |  | (43,894) |
Ending balance (in shares) at Jun. 30, 2023 |  | 217,862,921 |  |  |
Ending balance at Jun. 30, 2023 | 123,161 | $ 22 | 947,380 | (824,031) | (210)
Beginning balance (in shares) at Mar. 31, 2023 |  | 214,462,050 |  |  |
Beginning balance at Mar. 31, 2023 | 125,421 | $ 21 | 932,330 | (806,910) | (20)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock for services (in shares) |  | 86,095 |  |  |
Issuance of common stock for services | 337 |  | 337 |  |
Issuance of common stock upon exercise of options (in shares) |  | 62,993 |  |  |
Issuance of common stock upon exercise of options | 149 |  | 149 |  |
Issuance of common stock upon vesting of restricted stock units (in shares) |  | 215,301 |  |  |
Issuance of common stock in at the market offering (in shares) |  | 3,036,482 |  |  |
Issuance of common stock in at the market offering | 11,366 | $ 1 | 11,365 |  |
Stock-based compensation | 3,199 |  | 3,199 |  |
Unrealized losses on available-for-sale securities | (190) |  |  |  | (190)
Net loss | (17,121) |  |  | (17,121) |
Ending balance (in shares) at Jun. 30, 2023 |  | 217,862,921 |  |  |
Ending balance at Jun. 30, 2023 | 123,161 | $ 22 | 947,380 | (824,031) | (210)
Beginning balance (in shares) at Dec. 31, 2023 |  | 232,453,190 |  |  |
Beginning balance at Dec. 31, 2023 | 166,816 | $ 23 | 1,012,773 | (846,204) | 224
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 253,312 |  |  |
Issuance of common stock under employee stock purchase plan | 1,038 |  | 1,038 |  |
Issuance of common stock for services (in shares) |  | 40,549 |  |  |
Issuance of common stock for services | $ 257 |  | 257 |  |
Issuance of common stock upon exercise of options (in shares) | 1,564,000 | 1,564,269 |  |  |
Issuance of common stock upon exercise of options | $ 3,791 |  | 3,791 |  |
Issuance of common stock upon vesting of restricted stock units (in shares) |  | 1,090,078 |  |  |
Stock-based compensation | 18,385 |  | 18,385 |  |
Unrealized losses on available-for-sale securities | (325) |  |  |  | (325)
Net loss | (42,972) |  |  | (42,972) |
Ending balance (in shares) at Jun. 30, 2024 |  | 235,401,398 |  |  |
Ending balance at Jun. 30, 2024 | 146,990 | $ 23 | 1,036,244 | (889,176) | (101)
Beginning balance (in shares) at Mar. 31, 2024 |  | 233,959,744 |  |  |
Beginning balance at Mar. 31, 2024 | 150,891 | $ 23 | 1,023,610 | (872,722) | (20)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock for services (in shares) |  | 40,549 |  |  |
Issuance of common stock for services | 257 |  | 257 |  |
Issuance of common stock upon exercise of options (in shares) |  | 862,691 |  |  |
Issuance of common stock upon exercise of options | 1,608 |  | 1,608 |  |
Issuance of common stock upon vesting of restricted stock units (in shares) |  | 538,414 |  |  |
Stock-based compensation | 10,769 |  | 10,769 |  |
Unrealized losses on available-for-sale securities | (81) |  |  |  | (81)
Net loss | (16,454) |  |  | (16,454) |
Ending balance (in shares) at Jun. 30, 2024 |  | 235,401,398 |  |  |
Ending balance at Jun. 30, 2024 | $ 146,990 | $ 23 | $ 1,036,244 | $ (889,176) | $ (101)

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