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CONVERTIBLE PREFERRED STOCK (Details) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) shares | Dec. 31, 2020 USD ($) Series $ / shares shares | Jun. 30, 2021 USD ($) shares | Mar. 31, 2021 USD ($) shares | Jun. 30, 2020 USD ($) shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
CONVERTIBLE PREFERRED STOCK [Abstract] |  |  |  |  |  |  |  |
Number of issued series of convertible preferred stock | Series |  |  | 5 |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Issuance price per share (in dollars per share) | $ / shares | $ 0.0001 |  | $ 0.0001 |  |  |  |  |
Shares authorized (in shares) | 0 |  | 92,078,549 |  |  |  |  |
Shares issued (in shares) | 0 |  | 90,789,268 |  |  |  |  |
Shares outstanding (in shares) | 0 | 86,125,089 | 90,789,268 | 0 | 90,789,268 | 86,125,089 | 86,125,089 | 84,201,570
Total proceeds or exchange value | $ | $ 0 | $ 10,310 |  |  |  |  |  |
Net carrying value | $ | $ 0 | $ 170,831 | $ 195,814 | $ 0 | $ 195,810 | $ 170,831 | $ 170,843 | $ 160,555
Series A [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Year of class issuance |  |  | 2013 |  |  |  |  |
Issuance price per share (in dollars per share) | $ / shares |  |  | $ 0.04 |  |  |  |  |
Shares authorized (in shares) |  |  | 25,000,000 |  |  |  |  |
Shares issued (in shares) |  |  | 25,000,000 |  |  |  |  |
Shares outstanding (in shares) |  |  | 25,000,000 |  |  |  |  |
Total proceeds or exchange value | $ |  |  | $ 1,000 |  |  |  |  |
Issuance costs | $ |  |  | 0 |  |  |  |  |
Net carrying value | $ |  |  | $ 1,000 |  |  |  |  |
Initial liquidation price per share (in dollars per share) | $ / shares |  |  | $ 0.80 |  |  |  |  |
Series B [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Year of class issuance |  |  | 2015 |  |  |  |  |
Issuance price per share (in dollars per share) | $ / shares |  |  | $ 0.80 |  |  |  |  |
Shares authorized (in shares) |  |  | 31,250,000 |  |  |  |  |
Shares issued (in shares) |  |  | 31,250,000 |  |  |  |  |
Shares outstanding (in shares) |  |  | 31,250,000 |  |  |  |  |
Total proceeds or exchange value | $ |  |  | $ 25,000 |  |  |  |  |
Issuance costs | $ |  |  | 0 |  |  |  |  |
Net carrying value | $ |  |  | $ 25,000 |  |  |  |  |
Initial liquidation price per share (in dollars per share) | $ / shares |  |  | $ 0.80 |  |  |  |  |
Series C [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Issuance price per share (in dollars per share) | $ / shares |  |  | $ 4.61 |  |  |  |  |
Shares authorized (in shares) |  |  | 8,164,323 |  |  |  |  |
Shares issued (in shares) |  |  | 8,164,323 |  |  |  |  |
Shares outstanding (in shares) |  |  | 8,164,323 |  |  |  |  |
Total proceeds or exchange value | $ |  |  | $ 37,638 |  |  |  |  |
Issuance costs | $ |  |  | 328 |  |  |  |  |
Net carrying value | $ |  |  | $ 37,310 |  |  |  |  |
Initial liquidation price per share (in dollars per share) | $ / shares |  |  | $ 4.61 |  |  |  |  |
Series C [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Year of class issuance |  |  | 2015 |  |  |  |  |
Series C [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Year of class issuance |  |  | 2016 |  |  |  |  |
Series D [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Year of class issuance |  |  | 2017 |  |  |  |  |
Issuance price per share (in dollars per share) | $ / shares |  |  | $ 4.71 |  |  |  |  |
Shares authorized (in shares) |  |  | 12,738,853 |  |  |  |  |
Shares issued (in shares) |  |  | 12,738,853 |  |  |  |  |
Shares outstanding (in shares) |  |  | 12,738,853 |  |  |  |  |
Total proceeds or exchange value | $ |  |  | $ 60,000 |  |  |  |  |
Issuance costs | $ |  |  | 414 |  |  |  |  |
Net carrying value | $ |  |  | $ 59,586 |  |  |  |  |
Initial liquidation price per share (in dollars per share) | $ / shares |  |  | $ 4.71 |  |  |  |  |
Series E [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Issuance price per share (in dollars per share) | $ / shares |  |  | $ 5.36 |  |  |  |  |
Shares authorized (in shares) |  |  | 14,925,373 |  |  |  |  |
Shares issued (in shares) |  |  | 13,636,092 |  |  |  |  |
Shares outstanding (in shares) |  |  | 13,636,092 |  |  |  |  |
Total proceeds or exchange value | $ |  |  | $ 73,089 |  |  |  |  |
Issuance costs | $ |  |  | 171 |  |  |  |  |
Net carrying value | $ |  |  | $ 72,918 |  |  |  |  |
Initial liquidation price per share (in dollars per share) | $ / shares |  |  | $ 5.36 |  |  |  |  |
Series E [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Year of class issuance |  |  | 2018 |  |  |  |  |
Series E [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Year of class issuance |  |  | 2020 |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Exchange Ratio | 0.7975 |  |  |  |  |  |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock [Abstract] |  |  |  |  |  |  |  |
Exchange Ratio | 0.7975 |  |  |  |  |  |  |

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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 per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. 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 No definition available. + Details
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