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STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Loss | Accumulated Deficit | Series A Redeemable Convertible Preferred Stock | Series B Redeemable Convertible Preferred Stock | Series B-1 Redeemable Convertible Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | ---
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] |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 28,113 |  |  |  |  |  |
Exercise of stock options | 0 |  | 0 |  |  |  |  |
Vesting of common stock previously subject to vesting requirements (in shares) |  | 5,037 |  |  |  |  |  |
Stock-based compensation expense | 180 |  | 180 |  |  |  |  |
Unrealized gain (loss) on investments | 61 |  |  | 61 |  |  |  |
Net loss | (6,554) |  |  |  | (6,554) |  |  |
Ending balance (in shares) at Mar. 31, 2020 |  | 7,634,027 |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | (40,861) | $ 1 | 1,067 | 115 | (42,044) |  |  |
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 |
Sale of redeemable convertible preferred stock, net of issuance costs |  |  |  |  |  |  | $ 34,427 |
Preferred stock, ending balance (in shares) at Mar. 31, 2020 |  |  |  |  |  | 1,093,019 | 550,571 | 0
Preferred stock, ending balance at Mar. 31, 2020 |  |  |  |  |  | $ 49,064 | $ 34,427 | $ 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] |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments | (64) |  |  |  |  |  |  |
Net loss | (24,591) |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 7,779,280 |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | (58,360) | $ 1 | 1,730 | (10) | (60,081) |  |  |
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
Preferred stock, ending balance (in shares) at Sep. 30, 2020 |  |  |  |  |  | 1,093,019 | 550,571 | 1,319,964
Preferred stock, ending balance at Sep. 30, 2020 |  |  |  |  |  | $ 49,064 | $ 34,427 | $ 82,613
Beginning balance (in shares) at Mar. 31, 2020 |  | 7,634,027 |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | (40,861) | $ 1 | 1,067 | 115 | (42,044) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 20,131 |  |  |  |  |  |
Exercise of stock options | 0 |  | 0 |  |  |  |  |
Vesting of common stock previously subject to vesting requirements (in shares) |  | 5,037 |  |  |  |  |  |
Stock-based compensation expense | 137 |  | 137 |  |  |  |  |
Unrealized gain (loss) on investments | (97) |  |  | (97) |  |  |  |
Net loss | (6,208) |  |  |  | (6,208) |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 7,659,195 |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | (47,029) | $ 1 | 1,204 | 18 | (48,252) |  |  |
Preferred stock, beginning balance (in shares) at Mar. 31, 2020 |  |  |  |  |  | 1,093,019 | 550,571 | 0
Preferred stock, beginning balance at Mar. 31, 2020 |  |  |  |  |  | $ 49,064 | $ 34,427 | $ 0
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Sale of redeemable convertible preferred stock, net of issuance costs (in shares) |  |  |  |  |  |  |  | 1,319,964
Sale of redeemable convertible preferred stock, net of issuance costs |  |  |  |  |  |  |  | $ 82,618
Preferred stock, ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  | 1,093,019 | 550,571 | 1,319,964
Preferred stock, ending balance at Jun. 30, 2020 |  |  |  |  |  | $ 49,064 | $ 34,427 | $ 82,618
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 115,048 |  |  |  |  |  |
Exercise of stock options | 214 |  | 214 |  |  |  |  |
Vesting of common stock previously subject to vesting requirements (in shares) |  | 5,037 |  |  |  |  |  |
Stock-based compensation expense | 312 |  | 312 |  |  |  |  |
Unrealized gain (loss) on investments | (28) |  |  | (28) |  |  |  |
Net loss | (11,829) |  |  |  | (11,829) |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 7,779,280 |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | (58,360) | $ 1 | 1,730 | (10) | (60,081) |  |  |
Preferred stock, ending balance (in shares) at Sep. 30, 2020 |  |  |  |  |  | 1,093,019 | 550,571 | 1,319,964
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Series B-1 additional issuance costs |  |  |  |  |  |  |  | $ (5)
Preferred stock, ending balance at Sep. 30, 2020 |  |  |  |  |  | $ 49,064 | $ 34,427 | $ 82,613
Beginning balance (in shares) at Dec. 31, 2020 |  | 41,767,431 |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | 309,861 | $ 5 | 382,012 | (63) | (72,093) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 13,543 |  |  |  |  |  |
Exercise of stock options | 31 |  | 31 |  |  |  |  |
Vesting of common stock previously subject to vesting requirements (in shares) |  | 5,037 |  |  |  |  |  |
Stock-based compensation expense | 1,180 |  | 1,180 |  |  |  |  |
Unrealized gain (loss) on investments | (597) |  |  | (597) |  |  |  |
Net loss | (11,813) |  |  |  | (11,813) |  |  |
Ending balance (in shares) at Mar. 31, 2021 |  | 41,786,011 |  |  |  |  |  |
Ending balance at Mar. 31, 2021 | 298,662 | $ 5 | 383,223 | (660) | (83,906) |  |  |
Beginning balance (in shares) at Dec. 31, 2020 |  | 41,767,431 |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 309,861 | $ 5 | 382,012 | (63) | (72,093) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock options (in shares) | 460,692 |  |  |  |  |  |  |
Unrealized gain (loss) on investments | $ (1,764) |  |  |  |  |  |  |
Net loss | (52,821) |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2021 |  | 42,241,981 |  |  |  |  |  |
Ending balance at Sep. 30, 2021 | 261,166 | $ 5 | 387,902 | (1,827) | (124,914) |  |  |
Beginning balance (in shares) at Mar. 31, 2021 |  | 41,786,011 |  |  |  |  |  |
Beginning balance at Mar. 31, 2021 | 298,662 | $ 5 | 383,223 | (660) | (83,906) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 324,342 |  |  |  |  |  |
Exercise of stock options | 1,256 |  | 1,256 |  |  |  |  |
Vesting of common stock previously subject to vesting requirements (in shares) |  | 5,037 |  |  |  |  |  |
Stock-based compensation expense | 1,727 |  | 1,727 |  |  |  |  |
Unrealized gain (loss) on investments | (960) |  |  | (960) |  |  |  |
Net loss | (23,598) |  |  |  | (23,598) |  |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 42,115,390 |  |  |  |  |  |
Ending balance at Jun. 30, 2021 | 277,087 | $ 5 | 386,206 | (1,620) | (107,504) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock options and ESPP purchases (in shares) |  | 124,913 |  |  |  |  |  |
Exercise of stock options and ESPP purchases | 352 |  | 352 |  |  |  |  |
Vesting of common stock previously subject to vesting requirements (in shares) |  | 1,678 |  |  |  |  |  |
Stock-based compensation expense | 1,344 |  | 1,344 |  |  |  |  |
Unrealized gain (loss) on investments | (207) |  |  | (207) |  |  |  |
Net loss | (17,410) |  |  |  | (17,410) |  |  |
Ending balance (in shares) at Sep. 30, 2021 |  | 42,241,981 |  |  |  |  |  |
Ending balance at Sep. 30, 2021 | $ 261,166 | $ 5 | $ 387,902 | $ (1,827) | $ (124,914) |  |  |

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- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 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(28)) -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 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 + Details
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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=123467817&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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: 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=122038336&loc=d3e74512-122707 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(31)) -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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: 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 7: 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=123596393&loc=d3e14064-108612 Reference 8: 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 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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- 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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