Equity and Share-Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-based compensation expense	$ 533,000	$ 1,236,000	$ 1,864,000
Options exercised during period		90,000	32,200
Proceeds from stock options exercised		$ 615,000	$ 181,000

Number of share options (or share units) exercised during the current period.

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