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Basis of Presentation - Canada Emergency Wage Subsidy Program of 2020 - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Canada Emergency Wage Subsidy Program of 2020 |  |  |  |
Recognition of reduction in compensation expense | $ 1,778,000 | $ 4,711,000 | $ 5,850,000 | $ 9,056,000

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