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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT - Shares Reserved for Issuance (Details) - shares | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Common shares reserved for issuance | 270,663,755 | 277,129,612 | 273,914,985
Shares reserved for convertible preferred stock outstanding |  |  |
Common shares reserved for issuance | 175,531,186 | 175,440,744 | 191,142,894
Shares reserved for warrants to purchase shares of common stock |  |  |
Common shares reserved for issuance | 6,001,639 | 6,001,639 | 6,001,639
Shares reserved for warrants to purchase shares of preferred stock |  |  |
Common shares reserved for issuance | 44,205,800 | 44,296,242 | 29,624,663
Options issued and outstanding |  |  |
Common shares reserved for issuance | 44,914,082 | 51,379,939 | 42,846,649
Shares available for future option grants |  |  |
Common shares reserved for issuance | 11,048 | 11,048 | 4,299,140

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- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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