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Net Loss Per Share Attributable to Common Stockholders | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
Earnings Per Share [Abstract] |  |
Net Loss Per Share Attributable to Common Stockholders | 12. Net Loss Per Share Attributable to Common Stockholders The Company’s potentially dilutive securities include options to purchase common stock, unvested shares of restricted common stock, and redeemable convertible preferred stock. The Company’s potentially dilutive securities have been excluded from the computation of diluted net loss per share as the effect would be anti-dilutive. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at period end, from the computation of diluted net loss per share attributable to common stockholders for the period indicated because including them would have had an anti-dilutive effect:
|  | March 31, |
|  | 2022 |  |  | 2021 |
Redeemable convertible preferred stock |  |  | — |  |  |  | 22,359,669 |
Options to purchase common stock |  |  | 8,113,589 |  |  |  | 2,871,594 |
Unvested shares of restricted common stock from early exercises |  |  | 17,820 |  |  |  | 34,647 |
Restricted stock units |  |  | 702,663 |  |  |  | — |
Restricted stock units—executive officer |  |  | 952,804 |  |  |  | — |
Total |  |  | 9,786,876 |  |  |  | 25,265,910 |
| 14. Net Loss Per Share Attributable to Common Stockholders The Company’s potential dilutive securities, which include redeemable convertible preferred stock, options to purchase common stock, and unvested shares of restricted common stock, have been excluded from the computation of diluted net loss per share as the effect would be anti-dilutive. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at period end, from the computation of diluted net loss per share attributable to common stockholders for the period indicated because including them would have had an anti-dilutive effect:
|  | December 31, |
|  | 2021 |  |  | 2020 |
Redeemable convertible preferred stock |  |  | 24,785,564 |  |  |  | 14,388,857 |
Options to purchase common stock |  |  | 5,598,073 |  |  |  | 1,910,310 |
Unvested shares of restricted common stock from early exercises |  |  | 757 |  |  |  | 41,834 |
Restricted stock units |  |  | 952,804 |  |  |  | — |
Total |  |  | 31,337,198 |  |  |  | 16,341,001 |
Shares of redeemable convertible preferred stock also participated in dividends with shares of common stock (if and when declared) and therefore were deemed participating securities. The holders of redeemable convertible preferred stock did not contractually share in losses and therefore no additional net loss per share has been disclosed under the two-class method.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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