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- Definition

Decrease in revenue percent

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- Definition

Letters of credit as additional security for lease guarantees.

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- Definition

Net operating loss carrybacks, Period

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- Definition

Number of letters of credit.

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- Definition

Percentage of taxable income offset by net operating loss carryforwards and carrybacks.

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No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award, salary exchange program for award, percentage.

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No definition available.

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- Definition

Tax-deductible interest, base percentage.

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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

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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- Definition

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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- Definition

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

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Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) LetterofCredit shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Loss Contingencies [Line Items]
Number of letters of credit \| LetterofCredit	3
Letters of credit as additional security for lease guarantees	$ 0.7
Decrease in revenue	$ 22.5
Decrease in revenue percentage	7.20%
Revenue	$ 289.5	$ 312.1
Percentage of taxable income offset by NOL carryforwards and carrybacks	100.00%
Net operating loss carrybacks, period	5 years
Tax-deductible interest, base percentage	50.00%	50.00%	30.00%
Salary Exchange Program [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Percentage of salary exchange program for award	2.00%
Salary Exchange Program [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Percentage of salary exchange program for award	20.00%
Salary Exchange Program [Member] \| Employee Stock Options [Member]
Loss Contingencies [Line Items]
Options granted \| shares	417,673
Salary Exchange Program [Member] \| Restricted Stock Units [Member]
Loss Contingencies [Line Items]
Granted \| shares	211,207