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Stock Options and Restricted Shares - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of options exercised	$ 464	$ 1,141	$ 609	$ 315
Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized	$ 2,700				$ 2,700
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					26 months
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of options exercised					$ 2,200

X

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Value of stock issued as a result of the exercise of stock options.

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