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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT |  |
CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT | 9. CONVERTIBLE PREFERRED STOCK AND COMMON STOCK Convertible Preferred Stock The authorized, issued and outstanding shares of the convertible preferred stock and liquidation preferences were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 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 | ​
​ ​ | 13.CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ DEFICIT Convertible Preferred Stock 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
​ The rights, preferences, restrictions, and privileges of the holders of convertible preferred stock are as follows: Conversion At the option of the holder, each share of preferred stock is convertible into the number of fully paid and non-assessable shares of common stock at a conversion ratio that is equal to the original issuance price as adjusted for stock dividends, splits or combinations, divided by the applicable conversion price at the time of conversion. The conversion price is equal to the original issuance price, as adjusted for stock dividends, splits or combinations. The original issue price is $1.00, $0.4485, $0.4485, $0.7755, $1.5243, $1.5326 and $1.5326 for series 1, series A, series A’, series B, series C, series D and series D’, respectively. Each share of preferred stock automatically converts into the number of shares of common stock into which such shares are convertible at the then applicable conversion ratio upon: (i) the closing of the sale of the Company’s common stock in a public offering with aggregate gross proceeds of at least $20.0 million, or (ii) the consent of holders owning 66% of the then outstanding shares of preferred stock, voting together as a single class on an as-converted basis. Dividends The holders of preferred stock are entitled to receive non-cumulative dividends at an annual rate of $3.59, $0.0359, $0.0620, $0.1219, $0.1226 and $0.1226 per share for Series A, Series A’, Series B, Series C, Series D and Series D’, respectively, as adjusted for stock dividends, splits or combinations, per annum when and if declared by the Board of Directors. Dividends on preferred stock are non-cumulative and are payable prior to and in preference to any dividends on common stock. No dividends may be paid on any common stock unless and until a dividend is paid or declared and set aside on each outstanding share of preferred stock. The holders of convertible preferred stock are also entitled to participate in dividends on common stock on an as-converted basis. As of December 31, 2020 and 2019, no dividends have been paid or declared to date. Liquidation Rights In the event of any liquidation, dissolution or winding up of the Company, including a merger or acquisition where the beneficial owners of the Company’s common stock and preferred stock own less than 50% of the surviving entity, or a sale of all or substantially all Company assets, the holders of preferred stock will be entitled to receive a per share amount equal to the greater of (i) the liquidation preference rate, as adjusted for stock dividends, splits or combinations, plus all declared but unpaid dividends, or (ii) the amount per share that would have been payable had all the shares of convertible preferred stock had been converted into common stock. As of December 31, 2020 and 2019, the liquidation preference rates are $44.85 for Series A preferred stock, $0.4485 for Series A’ preferred stock, $0.7755 for Series B preferred stock, $1.5243 for Series C preferred stock, $1.5326 for Series D preferred stock and $1.5326 for Series D’ preferred stock. The Series D’ holders are entitled are entitled to receive its liquidation preference prior and in preference to the holders of other classes of convertible preferred stock or common stock, followed by Series D preferred stockholders, then Series C stockholders, then Series B stockholders, then the Series A’ stockholders and lastly by Series A stockholders. If there are insufficient assets and funds to allow for full payment to the holders of a particular class of senior preferred stock, distribution will be made ratably in proportion to the preferential amount each holder of such class of preferred stock is otherwise entitled to receive. After full payment has been made to the holders of senior preferred stock, the entire remaining liquidation proceeds, if any, will be distributed among the holders of Series 1 preferred stock and common stock, on an as-converted basis. Voting Each holder of preferred stock is entitled to the number of votes equal to the number of shares of common stock into which each such shares of preferred stock could be converted. Each holder of common stock is entitled to one vote for each share of common stock held. For as long as a minimum number of the originally issued shares remain outstanding, consent of the holders of at least 65% of the outstanding shares of preferred stock, voting as a single class, must approve certain actions. Classification The Company has classified its Series A, Series A’, Series B, Series C, Series D and Series D’ convertible preferred stock as mezzanine equity on the consolidated balance sheets as the stock is contingently redeemable. Upon the occurrence of certain deemed liquidation events that are outside the Company’s control, including liquidation, sale or transfer of the Company, holders of the convertible preferred stock can cause redemption for cash. During the years ended December 31, 2020 and 2019, the Company did not adjust the carrying value of the convertible preferred stock to the deemed liquidation value of such shares as a deemed liquidation event was not probable of occurring. Common Stock Holders of common stock are entitled to one vote per share on all matters to be voted upon by the stockholders of the Company. The Company had reserved shares of common stock for issuance, on an as-converted basis, as follows:
​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2020 |  | 2019
Shares reserved for convertible preferred stock outstanding |  | 175,440,744 |  | 191,142,894
Shares reserved for warrants to purchase shares of common stock |  | 6,001,639 |  | 6,001,639
Shares reserved for warrants to purchase shares of preferred stock |  | 44,296,242 |  | 29,624,663
Options issued and outstanding |  | 51,379,939 |  | 42,846,649
Shares available for future option grants |  | 11,048 |  | 4,299,140
Total |  | 277,129,612 |  | 273,914,985
​

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