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Share Capital - Textual (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 14, 2019 USD ($) $ / shares shares | Mar. 07, 2017 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) vote $ / shares shares | Dec. 31, 2019 USD ($) vote $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 shares
Share Capital [Line Items] |  |  |  |  |  |
Proceeds from issuance of common and convertible preference shares, net of issuance costs |  |  | $ 0 | $ 98,620,000 | $ 0 |
Issuance of common and convertible preference shares |  |  |  | 98,620,000 |  |
Convertible preference shares, 145,000 authorized, issued and outstanding at December 31, 2020 and 2019 |  |  | 152,746,000 | 152,746,000 |  |
Expenses for convertible preference shares |  |  |  |  | (97,000) |
Share-based Payment Arrangement, Expense |  |  | 5,774,000 | 2,460,000 | 5,892,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | $ 0 | 643,000 | 472,000 |
Convertible Preference Shares |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Proceeds from issuance of common and convertible preference shares, net of issuance costs | $ 98,620,000 |  |  |  |  |
Issuance of common and convertible preference shares |  |  |  | $ 62,623,000 |  |
Expenses for convertible preference shares |  |  |  |  | $ (97,000) |
Convertible Preference Shares | Series 4 Convertible Preferred Stock |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Issuance of common and convertible preference shares (in shares) | shares |  | 95,000 |  |  |  |
Sale of Stock, Issuance Authorized |  | $ 95,000,000 |  |  |  |
Proceeds from issuance of common and convertible preference shares, net of issuance costs |  | $ 90,123,000 |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares |  | $ 1,000 |  |  |  |
Preferred Stock, Conversion Price per Voting Share | $ / shares | $ 7.42 | $ 10.00 |  |  |  |
Preferred Stock, Accretion Percentage, Preference | 8.00% |  |  |  |  |
Preferred Stock, Accretion Rate, Preference Per Share | $ / shares |  |  | $ 8.84 | $ 8.17 |  |
Preferred Stock, Accretion of Redemption Discount |  |  | $ 9,789,000 | $ 9,043,000 |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 128,539,000 |  |  |
Shares outstanding (shares) | shares |  |  | 145,000,000 | 145,000,000 | 95,000,000 | 95,000,000
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price |  |  | 125.00% |  |  |
Preferred Stock, Liquidation Preference Percentage Rate, Change of Control of the Company |  |  | 7.00% |  |  |
Convertible Preference Shares | Series 6 Convertible Preferred Shares [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Issuance of common and convertible preference shares (in shares) | shares | 50,000,000 |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 62,623,000 |  |  |  |  |
Proceeds from issuance of common and convertible preference shares, net of issuance costs | $ 50,000,000 |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares | $ 1,000 |  |  |  |  |
Preferred Stock, Conversion Price per Voting Share | $ / shares | $ 5.00 |  |  |  |  |
Preferred Stock, Accretion Percentage, Preference | 8.00% |  |  |  |  |
Preferred Stock, Convertible Preference Shares, Accretion Period | 5 years |  |  |  |  |
Preferred Stock, Monthly Accretion of Redemption Discount |  |  | $ 7.54 | $ 6.96 |  |
Preferred Stock, Accretion of Redemption Discount |  |  | 4,390,000 | 3,261,000 |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 57,651,000 |  |  |
Preferred Stock, Convertible Preference Shares, Convertible at Company's Option, Term | 2 years |  |  |  |  |
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price | 125.00% |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.00% |  |  |  |  |
Common Stock and Other Paid-in Capital |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Issuance of common and convertible preference shares |  |  |  | $ 35,997,000 |  |
Common Shares | Common Class A |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Issuance of common and convertible preference shares (in shares) | shares | 14,285,714 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 50,000,000 |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 35,997,000 |  |  |  |  |
Shares outstanding (shares) | shares |  |  | 73,529,105 | 72,150,854 |  |
Common stock, voting rights, number of votes per share | vote |  |  | 1 |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  | $ 0 |  |  |
Common Shares | Common Class B |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Shares outstanding (shares) | shares |  |  |  | 3,743 | 3,749 | 3,755
Common stock, voting rights, number of votes per share | vote |  |  |  | 20 |  |
Employee Stock Incentive Plan [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  | 18,150,000 |  |  |
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance | shares |  |  | 5,108,583 |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price | $ / shares |  |  | $ 0 | $ 2.23 | $ 2.23 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  |  |  | 4 years 10 months 24 days |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  | 2.90% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  |  | 52.90% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  |  | 0.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  | 5 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period | shares |  |  | 111,866 |  | 0 |
Restricted Stock And Restricted Stock Units [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | $ 5,138,000 | $ 4,517,000 | $ 3,583,000 |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares |  |  | $ 1.19 | $ 1.14 |  |
Weighted average grant date fair value, granted (in dollars per share) | $ / shares |  |  | $ 0 |  |  |
Granted (in shares) | shares |  |  | 0 |  | 0 |
Exercises (in shares) | shares |  |  | 0 | 0 | 0 |
Vested (in shares) | shares |  |  |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | shares |  |  | 775,800 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  | 9 months 18 days |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  | $ 402,000 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 9 months 18 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  | 5 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  | 0.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period | shares |  |  | 250,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding |  |  | $ 480,000 |  |  |
Performance Shares [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares |  |  | $ 3.37 | $ 3.11 |  |
Weighted average grant date fair value, granted (in dollars per share) | $ / shares |  |  | $ 2.19 | $ 3.08 | $ 9.17 |
Granted (in shares) | shares |  |  | 685,369 |  |  |
Vested (in shares) | shares |  |  | 555,226 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  | $ 3,976,000 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  | 1 year 9 months 25 days |  |
Performance Shares [Member] | Restricted Stock And Restricted Stock Units [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  | 1 year 9 months 25 days |  |  |
Time Based Awards [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares |  |  | $ 2.29 | $ 5.53 |  |
Weighted average grant date fair value, granted (in dollars per share) | $ / shares |  |  | $ 1.97 | $ 2.54 | $ 7.38 |
Granted (in shares) | shares |  |  | 1,741,280 |  |  |
Vested (in shares) | shares |  |  | 1,031,159 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  | $ 570,000 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  | 1 year 25 days |  |
Time Based Awards [Member] | Restricted Stock And Restricted Stock Units [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  | 1 year 25 days |  |  |
Minimum | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares |  |  | $ 0.68 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  | 1.80% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  | 62.50% |  |
Maximum | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares |  |  | $ 1.41 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  | 2.30% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  | 67.10% |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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=116856206&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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