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Marketable Securities - Schedule of Marketable Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Market value, available for sale securities, current | $ 2.6 | $ 4.4
Market value, available for sale securities, noncurrent | 3.3 | 2.9
Non Current Assets |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Market value, available for sale securities, noncurrent | 3.3 | 2.9
Cost basis | 3.3 | 2.9
Current Assets |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Market value, available for sale securities, current | 2.6 | 4.4
Cost basis | $ 2.6 | $ 4.4

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