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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN MEZZANINE EQUITY AND STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | At-the-market Offering | Common stock | Common stock At-the-market Offering | Additional paid-in capital | Additional paid-in capital At-the-market Offering | Accumulated deficit
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2021 | 0 |  |  |  |  |  |
Beginning balance at Dec. 31, 2021 | $ 0 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2022 | 0 |  |  |  |  |  |
Ending balance at Jun. 30, 2022 | $ 0 |  |  |  |  |  |
Beginning balance (shares) at Dec. 31, 2021 |  |  | 2,976,541 |  |  |  |
Beginning balance at Dec. 31, 2021 | 48,636 |  | $ 5 |  | $ 688,156 |  | $ (639,525)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (3,806) |  |  |  |  |  | (3,806)
Reclassification due to reverse stock split | 0 |  | $ (5) |  | 5 |  |
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares) |  |  | 9,579 |  |  |  |
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan | 0 |  |  |  |  |  |
Stock-based compensation | 2,056 |  |  |  | 2,056 |  |
Issuance of commitment shares (in shares) |  |  |  | 92,644 |  |  |
Issuance of commitment shares |  | $ 0 |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) |  |  | 143,770 |  |  |  |
Issuance of common stock, net of issuance costs | 1,471 |  |  |  | 1,471 |  |
Ending balance (shares) at Jun. 30, 2022 |  |  | 3,222,534 |  |  |  |
Ending balance at Jun. 30, 2022 | $ 48,357 |  | $ 0 |  | 691,688 |  | (643,331)
Ending balance (in shares) at Jun. 30, 2022 | 0 |  |  |  |  |  |
Ending balance at Jun. 30, 2022 | $ 0 |  |  |  |  |  |
Beginning balance (shares) at Mar. 31, 2022 |  |  | 3,217,138 |  |  |  |
Beginning balance at Mar. 31, 2022 | 55,731 |  | $ 0 |  | 690,586 |  | (634,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (8,476) |  |  |  |  |  | (8,476)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares) |  |  | 5,396 |  |  |  |
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan | 25 |  |  |  | 25 |  |
Stock-based compensation | 1,163 |  |  |  | 1,163 |  |
Issuance of common stock, net of issuance costs |  | (86) |  |  |  | $ (86) |
Ending balance (shares) at Jun. 30, 2022 |  |  | 3,222,534 |  |  |  |
Ending balance at Jun. 30, 2022 | $ 48,357 |  | $ 0 |  | 691,688 |  | (643,331)
Beginning balance (in shares) at Dec. 31, 2022 | 3,000 |  |  |  |  |  |
Beginning balance at Dec. 31, 2022 | $ 211 |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Redemption of convertible preferred stock ( in shares) | (3,000) |  |  |  |  |  |
Redemption of convertible preferred stock | $ (211) |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2023 | 0 |  |  |  |  |  |
Ending balance at Jun. 30, 2023 | $ 0 |  |  |  |  |  |
Beginning balance (shares) at Dec. 31, 2022 | 3,229,704 |  | 3,229,704 |  |  |  |
Beginning balance at Dec. 31, 2022 | $ 31,202 |  | $ 0 |  | 693,937 |  | (662,735)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (15,680) |  |  |  |  |  | (15,680)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares) |  |  | 18,186 |  |  |  |
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan | 11 |  |  |  | 11 |  |
Stock-based compensation | 1,732 |  |  |  | 1,732 |  |
Redemption of convertible preferred stock | $ (149) |  |  |  |  |  | (149)
Issuance of common stock, net of issuance costs (in shares) |  |  |  | 34,589 |  |  |
Issuance of common stock, net of issuance costs |  | $ 156 |  |  |  | $ 156 |
Ending balance (shares) at Jun. 30, 2023 | 3,282,479 |  | 3,282,479 |  |  |  |
Ending balance at Jun. 30, 2023 | $ 17,272 |  | $ 0 |  | 695,836 |  | (678,564)
Ending balance (in shares) at Jun. 30, 2023 | 0 |  |  |  |  |  |
Ending balance at Jun. 30, 2023 | $ 0 |  |  |  |  |  |
Beginning balance (shares) at Mar. 31, 2023 |  |  | 3,271,282 |  |  |  |
Beginning balance at Mar. 31, 2023 | 26,431 |  | $ 0 |  | 694,937 |  | (668,506)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (10,058) |  |  |  |  |  | (10,058)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares) |  |  | 11,197 |  |  |  |
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan | 23 |  |  |  | 23 |  |
Stock-based compensation | $ 876 |  |  |  | 876 |  |
Ending balance (shares) at Jun. 30, 2023 | 3,282,479 |  | 3,282,479 |  |  |  |
Ending balance at Jun. 30, 2023 | $ 17,272 |  | $ 0 |  | $ 695,836 |  | $ (678,564)

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- Definition Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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