Stock-Based Compensation - Schedule of Common Stock Option Activity (Detail) - 2018 Stock Option and Incentive Plan and Inducement Plan [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options Outstanding, Beginning balance | shares	12,831,771
Number of Options, Granted | shares	3,296,179
Number of Options, Exercised | shares	(123,687)
Number of Options, Forfeited | shares	(501,517)
Number of Options Outstanding, Ending balance | shares	15,502,746
Number of Options, Vested and expected to vest | shares	15,502,746
Number of Options, Exercisable | shares	8,444,596
Weighted Average Exercise Price, Outstanding, Beginning balance | $ / shares	$ 9.19
Weighted Average Exercise Price, Granted | $ / shares	13.18
Weighted Average Exercise Price, Exercised | $ / shares	7.8
Weighted Average Exercise Price, Forfeited | $ / shares	10.91
Weighted Average Exercise Price, Outstanding, Ending balance | $ / shares	9.99
Weighted Average Exercise Price, Vested and expected to vest | $ / shares	9.99
Weighted Average Exercise Price, Exercisable | $ / shares	$ 9.49
Weighted Average Contractual Term, Outstanding, Ending balance	7 years 9 months 18 days
Weighted Average Contractual Term, Vested and expected to vest	7 years 9 months 18 days
Weighted Average Contractual Term, Exercisable	7 years 4 months 28 days
Aggregate Intrinsic Value, Outstanding | $	$ 1,343
Aggregate Intrinsic Value, Vested and expected to vest | $	1,343
Aggregate Intrinsic Value, Exercisable | $	$ 1,249