Equity and Share-Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-based compensation expense	$ 613,000	$ 465,000
Options exercised during period	0	24,000
Proceeds from stock options exercised		$ 120,000

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

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Balance Type:	na
Period Type:	duration