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Share-based Payments - Fair Value of Options Issued (Details) - Stock options | 12 Months Ended
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Dec. 31, 2020 $ / shares $ / shares | Dec. 31, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share price at grant date (in dollars per share) | $ 6.96 |
Exercise price (per option) (in dollars per share) | $ 6.96 |
Risk-free interest rate | 43.00% |
Expected life of options (in years) | 5 years | 5 years
Expected annualized volatility | 91.00% | 82.00%
Expected dividend yield | 0.00% | 0.00%
Weighted average Black-Scholes value at grant date (per option) (in dollars per share) | $ 4.84 | $ 13.03
Forfeiture rate | 0.00% | 0.00%
Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share price at grant date (in dollars per share) |  | $ 15.34
Exercise price (per option) (in dollars per share) |  | $ 15.34
Risk-free interest rate |  | 1.39%
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share price at grant date (in dollars per share) |  | $ 24.75
Exercise price (per option) (in dollars per share) |  | $ 24.75
Risk-free interest rate |  | 1.62%

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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Rate of weighted-average expected volatility for award under share-based payment arrangement. + 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 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 -Subparagraph (f)(2)(i) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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