Defined Contribution Plan, Vesting Period

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- Definition

Initial Vesting Percentage

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- Definition

Number Of Trading Period Days Where Entity's Average Closing Price Per Common Share Is Greater Than The Stated Lower Amount Triggering Vesting

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- Definition

Options Converted To Common Shares Exercise Price

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Options Convertible To Common Shares

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- Definition

Share Based Compensation Expense Average Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period After Termination

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- Definition

Stated Lower Amount Where Entity's Average Closing Price Per Common Share Is Greater Than The Stated Amount Triggering Vesting

+ References

No definition available.

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- Definition

Vesting Percentage

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

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- Definition

Value of stock issued under share-based plans to employees or officers which is the unearned portion, accounted for under the fair value method.

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- Definition

Amount of cost for defined contribution plan.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

+ References

No definition available.

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- Definition

Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders.

+ References

No definition available.

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Benefit Plans - Additional Information (Details) $ / shares in Units, $ in Thousands				12 Months Ended
	Dec. 31, 2010 $ / shares shares	Jan. 08, 2010 $ / shares shares	Dec. 31, 2008 $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (in shares)				0	0	0
Exercises in period, intrinsic value \| $				$ 26	$ 1,064
Options, exercisable, intrinsic value \| $				$ 91
Shares held in employee trust (in shares)				427,531	427,531
Initial vesting percentage				25.00%
Vesting percentage				100.00%
Vesting period (in years)				4 years
Cost recognized \| $				$ 397	$ 439	$ 357
Allocated share-based compensation expense \| $				$ 6,901	$ 8,333	$ 8,415
Options 2010 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (in shares)	1,248,501
Common share options exercise price (usd per share) \| $ / shares	$ 7.95
Expiration period after termination (in months)				6 months
Deferred compensation equity \| $				$ 2,422
Recognized compensation expense average period (in years)				5 years
Options 2010 [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 [Member] \| Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2010 [Member] \| Share-based Compensation Award, Tranche Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (in shares)		1,265,500
Common share options exercise price (usd per share) \| $ / shares		$ 6.39
Expiration period after termination (in months)				6 months
Deferred compensation equity \| $				$ 2,771
Recognized compensation expense average period (in years)				5 years
Options 2009 [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage		20.00%
Options 2009 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009 [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009 [Member] \| Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2009 [Member] \| Share-based Compensation Award, Tranche Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage	20.00%
Options 2008 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common share options granted (in shares)			2,000,000
Common share options exercise price (usd per share) \| $ / shares			$ 5.60
Number of trading period days (in days)			20 days
Options convertible to common shares			1.13
Options converted to common shares exercise price (usd per share) \| $ / shares			$ 4.97
Deferred compensation equity \| $				$ 2,480
Recognized compensation expense average period (in years)				3 years 7 months 6 days
Options 2008 [Member] \| Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Average closing price, lower limit (usd per share) \| $ / shares			8
Options 2008 [Member] \| Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Average closing price, lower limit (usd per share) \| $ / shares			$ 10
Options 2008 [Member] \| Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Award vesting rights, percentage			50.00%
Non-Management Award Grant [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares issued for services (in shares)				66,318	57,334	50,816
Shares issued for services, value \| $				$ 599	$ 596	$ 427
Non-vested Shares [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares issued for services (in shares)				237,570	237,560
Shares issued for services, value \| $				$ 2,190	$ 2,551
Non-options, nonvested, number (in shares)				3,455,077	3,767,298	3,151,310
Number of shares available for grant (in shares)				4,012,870
Compensation cost not yet recognized \| $				$ 7,915
Total compensation cost not yet recognized, period for recognition (in years)				2 years 1 month 6 days
Shares Subject to Time [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Non-options, nonvested, number (in shares)				1,495,608
Shares Subject to Performance [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Non-options, nonvested, number (in shares)				1,959,469