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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 basic and diluted net loss per share attributable to common stockholders |
|  | Three months ended
|  | March 31
|  | 2021 |  | 2020
|  | (In thousands, except share and per share data)
Numerator: |  |  |  |  |  |
Net income (loss) |  | $ | (3,508) |  | $ | (7,479)
Less dividends attributable to redeemable and redeemable convertible preferred stock |  |  | 5,541 |  |  | 2,947
Net loss attributable to common stockholders |  | $ | (9,049) |  | $ | (10,426)
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic and diluted |  |  | 29,185,545 |  |  | 22,045,779
Net loss per share attributable to common stockholders — basic and diluted |  | $ | (0.31) |  | $ | (0.47)
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | (In thousands, except share and per share data)
Numerator: |  |  |  |  |  |  |  |  |
Net loss |  | $ | (23,746) |  | $ | (625) |  | $ | (7,189)
Less dividends attributable to redeemable preferred stock and redeemable convertible preferred stock |  |  | 13,636 |  |  | 11,398 |  |  | 10,753
Net loss attributable to common stockholders |  | $ | (37,382) |  | $ | (12,023) |  | $ | (17,942)
Denominator: |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding — basic and diluted |  |  | 25,004,093 |  |  | 19,210,017 |  |  | 17,046,120
Net loss per share attributable to common stockholders — basic and diluted |  | $ | (1.50) |  | $ | (0.63) |  | $ | (1.05)
Schedule of excluded potential common shares |
|  | Three months ended
|  | March 31,
|  | 2021 |  | 2020
Options to purchase common stock |  | 16,543,679 |  | 8,545,131
Redeemable convertible preferred stock (as converted to common stock) |  | 111,452,020 |  | 111,452,020
Warrants |  | 722,212 |  | 197,305
|  | 128,717,911 |  | 120,194,456
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Options to purchase common stock |  | 8,232,203 |  | 9,773,702 |  | 11,282,417
Redeemable preferred stock and redeemable convertible preferred stock (as converted to common stock) |  | 111,452,020 |  | 111,452,020 |  | 111,452,020
Warrants |  | 222,414 |  | 237,978 |  | 219,125
|  | 119,906,637 |  | 121,463,700 |  | 122,953,562

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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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