Stock Option Plan - Stock Option Activity Under Stock Option Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Shares
Beginning Balance	693,909	711,058
Granted	259,122	313,167
Exercised		(1,750)
Cancelled	(487,133)	(328,566)
Ending Balance	465,898	693,909
Options exercisable, at end of period	415,376
Options available for future grant	1,302,411
Weighted Average Exercise Price
Beginning Balance	$ 27.6	$ 43.05
Granted	7.35	16.14
Exercised		12
Cancelled	17.7	50.1
Ending Balance	26.85	$ 27.6
Options exercisable, at end of period	$ 28.8
Weighted Average Contractual Term (Years)
Outstanding, at end of period	7 years 9 months 21 days
Options exercisable, at end of period	7 years 7 months 20 days
Aggregate Intrinsic Value
Outstanding, at end of period	$ 0
Options exercisable, at end of period	$ 0