Stock-Based Compensation - Additional Information (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	2,116,522
Class A CMN Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	5,000
1996 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance to directors and employees (in shares)	17,500,000
1996 Equity Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of awards of target number of share	0.00%
1996 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of awards of target number of share	100.00%
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration date of options granted under equity incentive plan	10 years
Options \| Percentage of awards vesting on grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vesting	20.00%
Options \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vesting	20.00%
Options \| Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vesting	20.00%
Options \| Share-based Payment Arrangement, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vesting	20.00%
Options \| Share-based Payment Arrangement, Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vesting	20.00%
Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Performance Based Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to performance based compensation agreements \| $	$ 0
Restricted Stock \| Non-employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to performance based compensation agreements \| $	$ 60
Restricted Stock \| Percentage of awards vesting on grant date \| Non-employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vesting	50.00%
Restricted Stock \| Share-based Payment Arrangement, Tranche Two \| Non-employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Percentage of awards vesting	50.00%

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

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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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