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Net Loss Per Share of Common Stock - Potentially dilutive securities have been excluded from the computation of diluted weighted average shares outstanding (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Earnings Per Share |  |  |  |
Potentially dilutive securities outstanding excluded from the computation of diluted weighted average shares outstanding | 12,194,058 | 5,138,294 | 12,194,058 | 5,138,294
Options to purchase common stock |  |  |  |
Earnings Per Share |  |  |  |
Potentially dilutive securities outstanding excluded from the computation of diluted weighted average shares outstanding | 10,518,263 | 4,268,277 | 10,518,263 | 4,268,277
RSUs |  |  |  |
Earnings Per Share |  |  |  |
Potentially dilutive securities outstanding excluded from the computation of diluted weighted average shares outstanding | 179,051 | 0 | 179,051 | 0
Warrants |  |  |  |
Earnings Per Share |  |  |  |
Potentially dilutive securities outstanding excluded from the computation of diluted weighted average shares outstanding | 946,179 | 870,017 | 946,179 | 870,017
Series A Preferred Stock |  |  |  |
Earnings Per Share |  |  |  |
Potentially dilutive securities outstanding excluded from the computation of diluted weighted average shares outstanding | 3,115 | 0 | 3,115 | 0
Series B Preferred Stock |  |  |  |
Earnings Per Share |  |  |  |
Potentially dilutive securities outstanding excluded from the computation of diluted weighted average shares outstanding | 547,450 | 0 | 547,450 | 0

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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=124432515&loc=d3e3550-109257 + Details
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