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Net Loss per Share - Antidilutive effect (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from the computation of diluted net loss per share (in shares) | 68,013,114 | 63,571,414 | 68,013,114 | 63,571,414
Finback BDA |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Shares issuable upon exercise of warrant (in shares) | 175,599 |  | 175,599 |
Unvested warrants (in shares) | 1,415,385 |  | 1,415,385 |
Options issued and outstanding |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from the computation of diluted net loss per share (in shares) | 22,340,997 | 21,567,577 | 22,340,997 | 21,567,577
Warrants | July 16, 2021 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from the computation of diluted net loss per share (in shares) | 14,324,893 | 14,324,994 | 14,324,893 | 14,324,994
Warrants | January 13, 2021 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from the computation of diluted net loss per share (in shares) | 1,590,984 | 2,421,200 | 1,590,984 | 2,421,200
Unvested restricted stock units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from the computation of diluted net loss per share (in shares) | 12,451,740 | 7,446,143 | 12,451,740 | 7,446,143
Unvested performance stock units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from the computation of diluted net loss per share (in shares) | 407,000 | 914,000 | 407,000 | 914,000
Earn Out Shares |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from the computation of diluted net loss per share (in shares) | 15,000,000 | 15,000,000 | 15,000,000 | 15,000,000
Contingently issuable common stock |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from the computation of diluted net loss per share (in shares) | 1,897,500 | 1,897,500 | 1,897,500 | 1,897,500

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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