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NET LOSS PER SHARE | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
NET LOSS PER SHARE |  |
NET LOSS PER SHARE | 11. 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 potentially dilutive shares were not included in the calculation of diluted shares outstanding for the periods presented as the effect would have been anti-dilutive: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​
​ | 16.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):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​ The following potentially dilutive shares were not included in the calculation of diluted shares outstanding for the periods presented as the effect would have been anti-dilutive: ​
​ | ​ | ​ | ​ | ​
​ |  | 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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