Significant Items Making up Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components Of Deferred Tax Assets And Liabilities [Abstract]
Allowances not currently deductible for tax purposes	$ 803	$ 777
Net operating loss carryforwards	35,252	41,730
Operating lease liabilities	834	1,018
General carryforwards	16,844	16,407
Stock-based compensation	1,272	1,471
Accrued and other	4,270	2,090
Deferred Tax Assets, Gross, Total	59,275	63,493
Less valuation allowance	(56,045)	(59,996)	$ (62,441)	$ (62,699)
Deferred Tax Assets, Net of Valuation Allowance, Total	3,230	3,497
Depreciation and amortization	(660)	(867)
Operating lease right-of-use assets	(493)	(693)
State income taxes	(2,077)	(1,937)
Deferred Tax Liabilities, Gross, Total	$ (3,230)	$ (3,497)