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Basis of Presentation and Summary of Significant Accounting Policies - Net Loss per Share (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Warrants |  |  |  |
Impairment Effects on Earnings Per Share [Line Items] |  |  |  |
Securities excluded from net loss per share calculation (less than for options in the three months ended June 30, 2020) (in shares) | 368 | 49 | 219 | 77
Convertible securities |  |  |  |
Impairment Effects on Earnings Per Share [Line Items] |  |  |  |
Securities excluded from net loss per share calculation (less than for options in the three months ended June 30, 2020) (in shares) | 175 | 175 | 175 | 346
Options |  |  |  |
Impairment Effects on Earnings Per Share [Line Items] |  |  |  |
Securities excluded from net loss per share calculation (less than for options in the three months ended June 30, 2020) (in shares) |  | 57 |  | 69
Restricted share units |  |  |  |
Impairment Effects on Earnings Per Share [Line Items] |  |  |  |
Securities excluded from net loss per share calculation (less than for options in the three months ended June 30, 2020) (in shares) | 16 | 9 | 8 | 3

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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