Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	9 Months Ended
	Jun. 30, 2022	Sep. 30, 2021
Number of Shares
Beginning balance (in shares)	1,916,051
Granted (in shares)	274,850
Forfeited (in shares)	(236,948)
Ending balance (in shares)	1,953,953
Number of shares Options, Exercisable (in shares)	1,060,219
Number of shares Options, Vested and expected to vest (in shares)	1,746,658
Weighted Average Exercise Price
Beginning balance (in usd per share)	$ 10.01
Granted (in usd per share)	1.74
Forfeited (in usd per share)	15.34
Ending balance (in usd per share)	8.20
Weighted average exercise price, Exercisable (in usd per share)	10.21
Weighted average exercise price, Vested and expected to vest (in usd per share)	$ 8.59
Weighted average contractual term outstanding (in years)	7 years 8 months 12 days	7 years 9 months 18 days
Weighted average contractual term outstanding, Exercisable (in years)	6 years 8 months 12 days
Weighted average contractual term outstanding, Vested and expected to vest (in years)	7 years 6 months
Aggregate intrinsic value, Beginning balance	$ 0
Aggregate intrinsic value, Ending balance	0
Aggregate intrinsic value, exercisable	0
Aggregate intrinsic value, vested and expected to vest	$ 0