Equity Incentive Plan - Summary of Company's Outstanding Restricted Common Stock (Detail) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		88,422
Expected future remaining compensation expense | $	$ 1,295	$ 1,295
Expected future compensation expense, restricted shares remaining vesting period		2 years 4 months 13 days
Restricted Shares Awarded on March 14, 2019 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		1,924
Date of Award		Mar. 14, 2019
Expected future remaining compensation expense | $	9	$ 9
Expected future compensation expense, restricted shares remaining vesting period		3 months
Restricted Shares Awarded on March 14, 2020 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		4,265
Date of Award		Mar. 14, 2020
Expected future remaining compensation expense | $	51	$ 51
Expected future compensation expense, restricted shares remaining vesting period		1 year 3 months
Restricted Shares Awarded on March 3, 2021 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		7,776
Date of Award		Mar. 03, 2021
Expected future remaining compensation expense | $	103	$ 103
Expected future compensation expense, restricted shares remaining vesting period		2 years 3 months
Restricted Shares Awarded on March 3, 2021 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		6,793
Date of Award		Mar. 03, 2021
Expected future remaining compensation expense | $	33	$ 33
Expected future compensation expense, restricted shares remaining vesting period		3 months
Restricted Shares Awarded on March 3, 2022 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		9,554
Date of Award		Mar. 03, 2022
Expected future remaining compensation expense | $	177	$ 177
Expected future compensation expense, restricted shares remaining vesting period		3 years 3 months
Restricted Shares Awarded on March 3, 2022 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		11,261
Date of Award		Mar. 03, 2022
Expected future remaining compensation expense | $	160	$ 160
Expected future compensation expense, restricted shares remaining vesting period		1 year 3 months
Restricted Shares Awarded on March 14, 2023 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		17,103
Date of Award		Mar. 14, 2023
Expected future remaining compensation expense | $	296	$ 296
Expected future compensation expense, restricted shares remaining vesting period		4 years 3 months
Restricted Shares Awarded on March 14, 2023 [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Granted		29,746
Date of Award		Mar. 14, 2023
Expected future remaining compensation expense | $	$ 466	$ 466
Expected future compensation expense, restricted shares remaining vesting period		2 years 3 months
Restricted Stock [Member]
Schedule Of Nonvested Stock Option Activity [Line Items]
Number of Restricted Shares, Nonvested at beginning of period	88,422	70,096
Number of Restricted Shares, Granted	0	47,536
Number of Restricted Shares, Vested	0	(27,470)
Number of Restricted Shares, Forfeited		(1,740)
Number of Restricted Shares, Nonvested at end of period	88,422	88,422
Weighted Average Grant Date Fair Value, Nonvested at beginning of period | $ / shares	$ 21.98	$ 21.88
Weighted Average Grant Date Fair Value, Granted | $ / shares	0	21.85
Weighted Average Grant Date Fair Value, Vested | $ / shares	0	21.52
Weighted Average Grant Date Fair Value, Forfeited | $ / shares		21.74
Weighted Average Grant Date Fair Value, Nonvested at end of period | $ / shares	$ 21.98	$ 21.98