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NET LOSS PER SHARE (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
NET LOSS PER SHARE |  |
Schedule of Computation of Basic and Diluted Net Loss Per Share | The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share amounts): ​
​ | ​ | Three Months Ended March 31, |
​ |  | 2021 |  | 2020 | ​
Numerator: | ​ | ​ | ​ | ​ | ​
Net loss attributable to common stockholders | ​ | $ | (82,553) | ​ | $ | (17,471) | ​
Less: Deemed dividend to preferred stockholders (see Note 7) | ​ | ​ | — | ​ | ​ | (9,484) | ​
​ | ​ | ​ | (82,553) | ​ | ​ | (26,955) | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted | ​ | ​ | 12,263,160 | ​ | ​ | 9,075,646 | ​
Net loss per share attributable to common stockholders, basic and diluted | ​ | $ | (6.73) | ​ | $ | (2.97) | ​
| The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share amounts):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2020 |  | 2019
Numerator: |  | ​ |  |  | ​ |
Net loss | ​ | $ | (156,124) | ​ | $ | (59,414)
Less: Deemed dividend to preferred stockholders (see Note 11) | ​ |  | (9,484) | ​ |  | (5,353)
Net loss attributable to common stockholders | ​ |  | (165,608) | ​ |  | (64,767)
Denominator: | ​ |  |  | ​ |  |
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted | ​ |  | 9,474,749 | ​ |  | 10,703,380
Net loss per share attributable to common stockholders, basic and diluted Net loss per share attributable to common stockholders, basic and diluted | ​ | $ | (17.48) | ​ | $ | (6.05)
​
Schedule of Potentially Dilutive Shares | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2021 |  | March 31, 2020 |
Convertible preferred stock | ​ | 175,531,186 | ​ | 175,593,476 | ​
Convertible promissory notes | ​ | 50,434,069 | ​ | 34,054,264 | ​
Outstanding stock options | ​ | 44,914,082 | ​ | 42,591,545 | ​
Outstanding common stock warrants | ​ | 6,001,639 | ​ | 6,001,639 | ​
Outstanding convertible preferred stock warrants | ​ | 44,205,800 | ​ | 38,947,463 | ​
Total | ​ | 321,086,776 | ​ | 297,188,387 | ​
| ​
​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2020 | 2019
Convertible preferred stock |  | 175,440,744 |  | 191,142,894
Convertible promissory notes |  | 48,730,782 |  | 24,157,103
Outstanding stock options |  | 51,379,939 |  | 42,846,649
Outstanding common stock warrants |  | 6,001,639 |  | 6,001,639
Outstanding convertible preferred stock warrants |  | 44,296,242 |  | 29,624,664
Total |  | 325,849,346 |  | 293,772,949

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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