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Net Loss Per Share - Summary of Calculation of Diluted Shares Outstanding (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Potentially dilutive shares not included in calculation of diluted shares outstanding | 7,853,010 | 93,497,146 | 73,920,658
Redeemable Convertible Preferred Stock |  |  |
Potentially dilutive shares not included in calculation of diluted shares outstanding |  | 83,568,628 | 66,825,300
Warrants |  |  |
Potentially dilutive shares not included in calculation of diluted shares outstanding |  | 161,136 | 161,136
Stock Options |  |  |
Potentially dilutive shares not included in calculation of diluted shares outstanding | 5,617,568 | 6,110,000 | 2,961,008
Restricted Stock Awards |  |  |
Potentially dilutive shares not included in calculation of diluted shares outstanding |  | 3,249,382 | 3,873,214
Restricted Stock Units |  |  |
Potentially dilutive shares not included in calculation of diluted shares outstanding | 2,235,442 | 408,000 | 100,000

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: 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=6371337&loc=d3e3550-109257 + Details
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