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Preferred Stock, Accretion Percentage, Preference

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Preferred Stock, Accretion Rate, Preference Per Share

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Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price

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Preferred Stock, Conversion Price per Voting Share

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Preferred Stock, Convertible Preference Shares, Accretion Period

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Preferred Stock, Convertible Preference Shares, Convertible at Company's Option, Term

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Preferred Stock, Liquidation Preference Percentage Rate, Change of Control of the Company

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Preferred Stock, Monthly Accretion of Redemption Discount

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Sale of Stock, Issuance Authorized

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period

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Stock Issued During Period, Value, Convertible Preferred Shares

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Face amount or stated value per share of common stock.

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Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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The amount of accretion of the preferred stock redemption discount during the period.

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The percentage rate used to calculate dividend payments on preferred stock.

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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.

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Number of shares authorized for issuance under share-based payment arrangement.

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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.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of shares issued which are neither cancelled nor held in the treasury.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Share Capital - Textual (Details)			12 Months Ended
Share Capital - Textual (Details)	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%