Income Taxes - Variations from Federal Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Expected federal income tax benefit at statutory rate of 21% in 2021 and 2020	$ 361	$ 147
Effect of permanent other differences	3	239
Effect of acquired intangible assets from business combination	(2,079)
Return to provision adjustments	58	134
State income tax expense (benefit), net of federal benefit tax assets	30	10
Valuation allowance	(384)	(350)
Provision for (benefit from) income taxes	$ (2,011)	$ 180