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STATEMENT OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Series A Redeemable Convertible Preferred Stock | Series A Redeemable Convertible Preferred Stock Common Stock | Series A Redeemable Convertible Preferred Stock Additional Paid-In Capital | Series B Redeemable Convertible Preferred Stock | Series B Redeemable Convertible Preferred Stock Common Stock | Series B Redeemable Convertible Preferred Stock Additional Paid-In Capital | Series B-1 Redeemable Convertible Preferred Stock | Series B-1 Redeemable Convertible Preferred Stock Common Stock | Series B-1 Redeemable Convertible Preferred Stock Additional Paid-In Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Preferred stock, beginning balance (in shares) at Dec. 31, 2019 |  |  |  |  |  | 1,093,019 |  |  | 0 |  |  | 0 |  |
Preferred stock, beginning balance at Dec. 31, 2019 |  |  |  |  |  | $ 49,064 |  |  | $ 0 |  |  | $ 0 |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of redeemable convertible preferred stock, net of issuance costs (in shares) |  |  |  |  |  |  |  |  | 550,571,000 |  |  | 1,319,964 |  |
Sale of redeemable convertible preferred stock, net of issuance costs |  |  |  |  |  |  |  |  | $ 34,427 |  |  | $ 82,613 |  |
Conversion of redeemable convertible preferred stock (in shares) |  |  |  |  |  | (1,093,019) |  |  | (550,571,000) |  |  | (1,319,964) |  |
Conversion of redeemable convertible preferred stock |  |  |  |  |  | $ (49,064) |  |  | $ (34,427) |  |  | $ (82,613) |  |
Preferred stock, ending balance (in shares) at Dec. 31, 2020 |  |  |  |  |  | 0 |  |  | 0 |  |  | 0 |  |
Preferred stock, ending balance at Dec. 31, 2020 |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  | $ 0 |  |
Beginning balance (in shares) at Dec. 31, 2019 |  | 7,600,877 |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | $ (34,548) | $ 1 | $ 887 | $ 54 | $ (35,490) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of redeemable convertible preferred stock (in shares) |  |  |  |  |  |  | 7,487,151 |  |  | 3,771,363 |  |  | 9,041,739 |
Conversion of redeemable convertible preferred stock |  |  |  |  |  | $ 49,064 | $ 1 | $ 49,063 | $ 34,427 | $ 1 | $ 34,426 | $ 82,613 | $ 1 | $ 82,612
Issuance of common stock upon initial public offering, net of issuance cost (in shares) |  | 13,664,704 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon initial public offering, net of issuance cost | 213,530 | $ 1 | 213,529 |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 181,449 |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 229 | $ 0 | 229 |  |  |  |  |  |  |  |  |  |  |
Vesting of common stock previously subject to vesting (in shares) |  | 20,148 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 1,266 |  | 1,266 |  |  |  |  |  |  |  |  |  |  |
Unrealized loss on investments | (117) |  |  | (117) |  |  |  |  |  |  |  |  |  |
Net loss | (36,603) |  |  |  | (36,603) |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2020 |  | 41,767,431 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 309,861 | $ 5 | 382,012 | (63) | (72,093) |  |  |  |  |  |  |  |  |
Preferred stock, ending balance (in shares) at Dec. 31, 2021 |  |  |  |  |  | 0 |  |  | 0 |  |  | 0 |  |
Preferred stock, ending balance at Dec. 31, 2021 |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  | $ 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) | 557,609 |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of common stock previously subject to vesting (in shares) |  | 11,752 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 5,467 |  | 5,467 |  |  |  |  |  |  |  |  |  |  |
Unrealized loss on investments | (497) |  |  | (497) |  |  |  |  |  |  |  |  |  |
Net loss | (44,974) |  |  |  | (44,974) |  |  |  |  |  |  |  |  |
Exercise of stock options and ESPP purchases (in shares) |  | 559,715 |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and ESPP purchases | 1,929 |  | 1,929 |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2021 |  | 42,338,898 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2021 | $ 271,786 | $ 5 | $ 389,408 | $ (560) | $ (117,067) |  |  |  |  |  |  |  |  |

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 + Details
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