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CONVERTIBLE PREFERRED STOCK - Summary of Authorized, Issued and Outstanding Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 06, 2021 | Dec. 31, 2020
Temporary Equity [Line Items] |  |
Shares Authorized | 129,788,828 | 129,788,828
Shares Issued | 109,182,191 | 95,010,858
Shares Outstanding | 109,182,191 | 95,010,858
Total Proceeds or Exchange Value | $ 159,119 | $ 128,651
Issuance Costs | 372 | 365
Net Carrying Value | $ 158,747 | $ 128,286
Series A |  |
Temporary Equity [Line Items] |  |
Year of Class Issuance | 2014 | 2014
Issuance Price per share | $ 0.04 | $ 0.04
Shares Authorized | 25,000,000 | 25,000,000
Shares Issued | 25,000,000 | 25,000,000
Shares Outstanding | 25,000,000 | 25,000,000
Total Proceeds or Exchange Value | $ 1,000 | $ 1,000
Issuance Costs | 2 | 2
Net Carrying Value | $ 998 | $ 998
Initial Liquidation Price per share | $ 0.80 | $ 0.80
Series B |  |
Temporary Equity [Line Items] |  |
Year of Class Issuance | 2017 | 2017
Issuance Price per share | $ 0.80 | $ 0.80
Shares Authorized | 10,625,000 | 10,625,000
Shares Issued | 10,625,000 | 10,625,000
Shares Outstanding | 10,625,000 | 10,625,000
Total Proceeds or Exchange Value | $ 8,500 | $ 8,500
Issuance Costs | 0 | 0
Net Carrying Value | $ 8,500 | $ 8,500
Initial Liquidation Price per share | $ 0.80 | $ 0.80
Series C |  |
Temporary Equity [Line Items] |  |
Year of Class Issuance | 2017 | 2017
Issuance Price per share | $ 1.88 | $ 1.88
Shares Authorized | 31,586,210 | 31,586,210
Shares Issued | 31,586,210 | 31,586,210
Shares Outstanding | 31,586,210 | 31,586,210
Total Proceeds or Exchange Value | $ 59,382 | $ 59,382
Issuance Costs | 234 | 234
Net Carrying Value | $ 59,148 | $ 59,148
Initial Liquidation Price per share | $ 1.88 | $ 1.88
Series D |  |
Temporary Equity [Line Items] |  |
Year of Class Issuance |  | 2020
Issuance Price per share | $ 2.15 | $ 2.15
Shares Authorized | 62,577,618 | 62,577,618
Shares Issued | 41,970,981 | 27,799,648
Shares Outstanding | 41,970,981 | 27,799,648
Total Proceeds or Exchange Value | $ 90,237 | $ 59,769
Issuance Costs | 136 | 129
Net Carrying Value | $ 90,101 | $ 59,640
Initial Liquidation Price per share | $ 2.15 | $ 2.15
Series D | Minimum |  |
Temporary Equity [Line Items] |  |
Year of Class Issuance | 2020 |
Series D | Maximum |  |
Temporary Equity [Line Items] |  |
Year of Class Issuance | 2021 |

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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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- Definition Per share amount of par value or stated value of stock classified as temporary 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=122040564&loc=d3e177068-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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