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CONVERTIBLE PREFERRED STOCK AND COMMON STOCK (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT |  |
Temporary Equity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 |
​ |  | Authorized Shares |  | Outstanding Shares |  | Net Carrying Value |  | Liquidation Preference | ​
​ | ​ | ​ | ​ | ​ | ​ | (in thousands) | ​
Series D’ | ​ | 190,000,000 | ​ | 105,386,149 | ​ | $ | 129,339 | ​ | $ | 161,515 | ​
Series D | ​ | 87,235,535 | ​ | 33,483,143 | ​ | ​ | 46,979 | ​ | ​ | 51,316 | ​
Series C | ​ | 64,129,209 | ​ | 23,298,388 | ​ | ​ | 35,293 | ​ | ​ | 35,514 | ​
Series B | ​ | 36,969,407 | ​ | 9,185,302 | ​ | ​ | 7,049 | ​ | ​ | 7,123 | ​
Series A’ | ​ | 30,991,277 | ​ | 4,158,503 | ​ | ​ | 1,702 | ​ | ​ | 1,865 | ​
Series A | ​ | 21,288 | ​ | 16,740 | ​ | ​ | 593 | ​ | ​ | 751 | ​
Series 1 | ​ | 4,305 | ​ | 2,961 | ​ | ​ | — | ​ | ​ | — | ​
Total | ​ | 409,351,021 | ​ | 175,531,186 | ​ | $ | 220,955 | ​ | $ | 258,084 | ​
| The authorized, issued and outstanding shares of the convertible preferred stock and liquidation preferences as of the periods presented were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2020
​ | ​ | Authorized |  | Outstanding |  | Net Carrying |  | Liquidation
​ | ​ | Shares | ​ | Shares | ​ | Value | ​ | Preference
​ | ​ | ​ | ​ | ​ | ​ | (in thousands)
Series D’ |  | 190,000,000 |  | 105,386,149 | ​ | $ | 129,339 | ​ | $ | 161,516
Series D |  | 87,235,535 |  | 33,392,701 | ​ |  | 46,587 | ​ |  | 51,178
Series C |  | 64,129,209 |  | 23,298,388 | ​ |  | 35,293 | ​ |  | 35,514
Series B |  | 36,969,407 |  | 9,185,302 | ​ |  | 7,049 | ​ |  | 7,123
Series A’ |  | 30,991,277 |  | 4,158,503 | ​ |  | 1,702 | ​ |  | 1,865
Series A |  | 21,288 |  | 16,740 | ​ |  | 593 | ​ |  | 751
Series 1 |  | 4,305 |  | 2,961 | ​ |  | — | ​ |  | —
Total |  | 409,351,021 |  | 175,440,744 | ​ | $ | 220,563 | ​ | $ | 257,947
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ |  | Authorized |  | Outstanding |  | Net Carrying |  | Liquidation
​ | ​ | Shares | ​ | Shares | ​ | Value | ​ | Preference
​ | ​ | ​ | ​ | ​ | ​ | (in thousands)
Series D’ |  | 102,000,000 |  | 78,932,752 | ​ | $ | 99,588 | ​ | $ | 120,972
Series D |  | 87,235,535 |  | 35,586,652 | ​ |  | 49,772 | ​ |  | 54,540
Series C |  | 64,129,209 |  | 41,305,384 | ​ |  | 62,570 | ​ |  | 62,962
Series B |  | 36,969,407 |  | 9,126,596 | ​ |  | 7,071 | ​ |  | 7,078
Series A’ |  | 30,991,277 |  | 26,171,809 | ​ |  | 11,535 | ​ |  | 11,738
Series A |  | 21,288 |  | 16,740 | ​ |  | 593 | ​ |  | 751
Series 1 |  | 4,305 |  | 2,961 | ​ |  | — | ​ |  | —
Total |  | 321,351,021 |  | 191,142,894 | ​ | $ | 231,129 | ​ | $ | 258,041
​
Reserved shares of common stock for issuance | The Company had reserved shares of common stock for issuance, on an as-converted basis, as follows: ​
​ | ​ | ​ | ​
​ |  | March 31, 2021 |
Shares reserved for convertible preferred stock outstanding | ​ | 175,531,186 | ​
Shares reserved for warrants to purchase shares of common stock | ​ | 6,001,639 | ​
Shares reserved for warrants to purchase shares of preferred stock | ​ | 44,205,800 | ​
Options issued and outstanding | ​ | 44,914,082 | ​
Shares available for future option grants | ​ | 11,048 | ​
Total | ​ | 270,663,755 | ​

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- Definition Tabular disclosure of 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. 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 (27) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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=65877616&loc=d3e177068-122764 + Details
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