Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Intangible Assets And Goodwill [Line Items]
Intangible assets, gross	$ 2,800	$ 2,800
Intangible assets, accumulated amortization	$ (2,800)	$ (2,800)
Useful life	indefinite life	indefinite life
Goodwill gross	$ 2,926	$ 2,926
Goodwill	2,926	2,926
Patents
Intangible Assets And Goodwill [Line Items]
Intangible assets, gross	1,914	1,914
Intangible assets, accumulated amortization	$ (1,914)	$ (1,914)
Patents | Minimum
Intangible Assets And Goodwill [Line Items]
Useful life	4 years	4 years
Patents | Maximum
Intangible Assets And Goodwill [Line Items]
Useful life	10 years	10 years
Trademarks
Intangible Assets And Goodwill [Line Items]
Useful life	6 years	6 years
Intangible assets, gross	$ 69	$ 69
Intangible assets, accumulated amortization	(69)	(69)
Other Intangible Assets
Intangible Assets And Goodwill [Line Items]
Intangible assets, gross	817	817
Intangible assets, accumulated amortization	$ (817)	$ (817)
Other Intangible Assets | Minimum
Intangible Assets And Goodwill [Line Items]
Useful life	4 years	4 years
Other Intangible Assets | Maximum
Intangible Assets And Goodwill [Line Items]
Useful life	6 years	6 years