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Share-based Payments - Schedule of Stock Options Outstanding (Details) - shares | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options outstanding (in shares) | 13,755,148 | 14,149,502 | 12,902,995
2020 Omnibus Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options outstanding (in shares) | 2,000,000 | 0 | 0
2018 Stock Option Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options outstanding (in shares) | 1,627,715 | 1,817,287 | 285,000
2015 Stock Option Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options outstanding (in shares) | 10,127,433 | 12,332,215 | 12,617,995

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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