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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands | Total | IPO | Redeemable Convertible Preferred Stock | Redeemable Convertible Preferred Stock IPO | Common Stock | Common Stock IPO | Additional Paid-In Capital | Additional Paid-In Capital IPO | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2019 |  |  | $ 64,256 |  |  |  |  |  |
Beginning Balance, shares at Dec. 31, 2019 |  |  | 9,804,640 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2019 | $ (54,683) |  |  |  | $ 9 |  | $ 656 |  | $ (55,348)
Beginning Balance, shares at Dec. 31, 2019 |  |  |  |  | 9,319,466 |  |  |  |
Issuance of Series E convertible preferred stock | 0 |  | $ 30,055 |  |  |  |  |  |
Issuance of Series E convertible preferred stock, shares |  |  | 1,899,847 |  |  |  |  |  |
Exercise of stock options | 1 |  |  |  |  |  | 1 |  |
Exercise of stock options, shares |  |  |  |  | 1,500 |  |  |  |
Stock-based compensation expense | 61 |  |  |  |  |  | 61 |  |
Net loss and comprehensive loss | (9,175) |  |  |  |  |  |  |  | (9,175)
Ending Balance at Mar. 31, 2020 |  |  | $ 94,311 |  |  |  |  |  |
Ending Balance, shares at Mar. 31, 2020 |  |  | 11,704,487 |  |  |  |  |  |
Ending Balance at Mar. 31, 2020 | (63,796) |  |  |  | $ 9 |  | 718 |  | (64,523)
Ending Balance, shares at Mar. 31, 2020 |  |  |  |  | 9,320,966 |  |  |  |
Beginning Balance at Dec. 31, 2019 |  |  | $ 64,256 |  |  |  |  |  |
Beginning Balance, shares at Dec. 31, 2019 |  |  | 9,804,640 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2019 | (54,683) |  |  |  | $ 9 |  | 656 |  | (55,348)
Beginning Balance, shares at Dec. 31, 2019 |  |  |  |  | 9,319,466 |  |  |  |
Net loss and comprehensive loss | (25,588) |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 |  |  | $ 94,244 |  |  |  |  |  |
Ending Balance, shares at Sep. 30, 2020 |  |  | 11,704,487 |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 | (79,960) |  |  |  | $ 9 |  | 967 |  | (80,936)
Ending Balance, shares at Sep. 30, 2020 |  |  |  |  | 9,375,832 |  |  |  |
Beginning Balance at Mar. 31, 2020 |  |  | $ 94,311 |  |  |  |  |  |
Beginning Balance, shares at Mar. 31, 2020 |  |  | 11,704,487 |  |  |  |  |  |
Beginning Balance at Mar. 31, 2020 | (63,796) |  |  |  | $ 9 |  | 718 |  | (64,523)
Beginning Balance, shares at Mar. 31, 2020 |  |  |  |  | 9,320,966 |  |  |  |
Issuance of Series E convertible preferred stock | 0 |  | $ 12 |  |  |  |  |  |
Exercise of stock options | 7 |  |  |  |  |  | 7 |  |
Exercise of stock options, shares |  |  |  |  | 20,520 |  |  |  |
Stock-based compensation expense | 65 |  |  |  |  |  | 65 |  |
Net loss and comprehensive loss | (8,316) |  |  |  |  |  |  |  | (8,316)
Ending Balance at Jun. 30, 2020 | (72,040) |  | $ 94,299 |  | $ 9 |  | 790 |  | (72,839)
Ending Balance, shares at Jun. 30, 2020 |  |  | 11,704,487 |  | 9,341,486 |  |  |  |
Series F redeemable convertible preferred stock issuance cost | 0 |  | $ (55) |  |  |  |  |  |
Exercise of stock options | 12 |  |  |  |  |  | 12 |  |
Exercise of stock options, shares |  |  |  |  | 34,346 |  |  |  |
Stock-based compensation expense | 165 |  |  |  |  |  | 165 |  |
Net loss and comprehensive loss | (8,097) |  |  |  |  |  |  |  | (8,097)
Ending Balance at Sep. 30, 2020 |  |  | $ 94,244 |  |  |  |  |  |
Ending Balance, shares at Sep. 30, 2020 |  |  | 11,704,487 |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 | $ (79,960) |  |  |  | $ 9 |  | 967 |  | (80,936)
Ending Balance, shares at Sep. 30, 2020 |  |  |  |  | 9,375,832 |  |  |  |
Beginning Balance at Dec. 31, 2020 |  |  | $ 117,331 |  |  |  |  |  |
Beginning Balance, shares at Dec. 31, 2020 | 12,767,202 |  | 12,767,202 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2020 | $ (88,849) |  |  |  | $ 9 |  | 1,183 |  | (90,041)
Beginning Balance, shares at Dec. 31, 2020 |  |  |  |  | 9,509,182 |  |  |  |
Exercise of stock options | 11 |  |  |  |  |  | 11 |  |
Exercise of stock options, shares |  |  |  |  | 16,862 |  |  |  |
Stock-based compensation expense | 277 |  |  |  |  |  | 277 |  |
Net loss and comprehensive loss | (12,240) |  |  |  |  |  |  |  | (12,240)
Ending Balance at Mar. 31, 2021 |  |  | $ 117,331 |  |  |  |  |  |
Ending Balance, shares at Mar. 31, 2021 |  |  | 12,767,202 |  |  |  |  |  |
Ending Balance at Mar. 31, 2021 | $ (100,801) |  |  |  | $ 9 |  | 1,471 |  | (102,281)
Ending Balance, shares at Mar. 31, 2021 |  |  |  |  | 9,526,044 |  |  |  |
Beginning Balance at Dec. 31, 2020 |  |  | $ 117,331 |  |  |  |  |  |
Beginning Balance, shares at Dec. 31, 2020 | 12,767,202 |  | 12,767,202 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2020 | $ (88,849) |  |  |  | $ 9 |  | 1,183 |  | (90,041)
Beginning Balance, shares at Dec. 31, 2020 |  |  |  |  | 9,509,182 |  |  |  |
Conversion of redeemable convertible preferred stock | 25,534,404 |  |  |  |  |  |  |  |
Net loss and comprehensive loss | $ (47,024) |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2021 |  |  | $ 0 |  |  |  |  |  |
Ending Balance, shares at Sep. 30, 2021 |  |  | 0 |  |  |  |  |  |
Ending Balance at Sep. 30, 2021 | 245,976 |  |  |  | $ 49 |  | 382,992 |  | (137,065)
Ending Balance, shares at Sep. 30, 2021 |  |  |  |  | 47,292,022 |  |  |  |
Beginning Balance at Mar. 31, 2021 |  |  | $ 117,331 |  |  |  |  |  |
Beginning Balance, shares at Mar. 31, 2021 |  |  | 12,767,202 |  |  |  |  |  |
Beginning Balance at Mar. 31, 2021 | (100,801) |  |  |  | $ 9 |  | 1,471 |  | (102,281)
Beginning Balance, shares at Mar. 31, 2021 |  |  |  |  | 9,526,044 |  |  |  |
Exercise of stock options | 196 |  |  |  |  |  | 196 |  |
Exercise of stock options, shares |  |  |  |  | 205,988 |  |  |  |
Stock-based compensation expense | 931 |  |  |  |  |  | 931 |  |
Net loss and comprehensive loss | (17,615) |  |  |  |  |  |  |  | (17,615)
Ending Balance at Jun. 30, 2021 |  |  | $ 117,331 |  |  |  |  |  |
Ending Balance, shares at Jun. 30, 2021 |  |  | 12,767,202 |  |  |  |  |  |
Ending Balance at Jun. 30, 2021 | (117,289) |  |  |  | $ 9 |  | 2,598 |  | (119,896)
Ending Balance, shares at Jun. 30, 2021 |  |  |  |  | 9,732,032 |  |  |  |
Conversion of redeemable convertible preferred stock to common stock upon initial public offering |  | $ 117,331 |  | $ (117,331) |  | $ 27 |  | $ 117,304 |
Conversion of redeemable convertible preferred stock |  |  |  | (12,767,202) |  | 25,534,404 |  |  |
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering costs of $23.8 million | 252,174 |  |  |  | $ 12 |  | 252,162 |  |
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering costs of $23.8 million, shares |  |  |  |  | 11,500,000 |  |  |  |
Conversion of redeemable convertible preferred stock warrants to common stock warrants upon initial public offering |  | $ 8,973 |  |  |  |  |  | $ 8,973 |
Exercise of common stock warrants | 0 |  |  |  | $ 1 |  | (1) |  |
Exercise of common stock warrants, shares |  |  |  |  | 483,554 |  |  |  |
Exercise of stock options | 57 |  |  |  |  |  | 57 |  |
Exercise of stock options, shares |  |  |  |  | 42,032 |  |  |  |
Stock-based compensation expense | 1,899 |  |  |  |  |  | 1,899 |  |
Net loss and comprehensive loss | (17,169) |  |  |  |  |  |  |  | (17,169)
Ending Balance at Sep. 30, 2021 |  |  | $ 0 |  |  |  |  |  |
Ending Balance, shares at Sep. 30, 2021 |  |  | 0 |  |  |  |  |  |
Ending Balance at Sep. 30, 2021 | $ 245,976 |  |  |  | $ 49 |  | $ 382,992 |  | $ (137,065)
Ending Balance, shares at Sep. 30, 2021 |  |  |  |  | 47,292,022 |  |  |  |

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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Carrying amount, attributable to parent, 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 No definition available. + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. 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. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Value of new stock classified as temporary equity issued during the period. + References No definition available. + Details
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