Stock-Based Compensation - Information about Stock Options Outstanding Under all Stock Plans (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Intrinsic Value | $	$ 2
Options Exercisable, Weighted Average Contractual Life (Years)	2 years 7 months 17 days
Options Exercisable, Intrinsic Value | $	$ 2
Options Outstanding, Weighted Average Contractual Life (Years)	2 years 8 months 1 day
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices | $ / shares	$ 5.06
Upper range of exercise prices | $ / shares	$ 6.98
Options Outstanding, Number | shares	4,000
Options Outstanding, Weighted Average Contractual Life (Years)	2 years 2 months 1 day
Options Outstanding, Intrinsic Value | $	$ 0
Options Outstanding, Weighted-Average Exercise Price | $ / shares	$ 6.02
Options Exercisable, Number | shares	4,000
Options Exercisable, Weighted Average Contractual Life (Years)	2 years 2 months 1 day
Options Exercisable, Intrinsic Value | $	$ 0
Options Exercisable, Weighted Average Exercise Price | $ / shares	$ 6.02