Share-Based Payments - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2021	Oct. 31, 2020	Apr. 30, 2021
Total
Outstanding, beginning balance (in shares)	1,653,646
Granted (in shares)	85,532
Exercised (in shares)	(1,000)
Forfeited (in shares)	(3,750)
Canceled (in shares)	0
Expired (in shares)	0
Outstanding, ending balance (in shares)	1,734,428
Vested and expected to vest (in shares)	1,734,428
Exercisable (in shares)	1,363,336
Weighted Average Exercise Price
Outstanding, beginning balance (in usd per share)	$ 3.96
Granted (in usd per share)	9.01
Exercised (in usd per share)	2.10
Forfeited (in usd per share)	10.64
Canceled (in usd per share)	0
Expired (in usd per share)	0
Outstanding, ending balance (in usd per share)	4.19
Vested and expected to vest (in usd per share)	4.19
Exercisable (in usd per share)	$ 3.50
Weighted Average Remaining Contractual Life (Years)
Outstanding (in years)	5 years 4 months 24 days	5 years 4 months 24 days
Outstanding, granted (in years)	9 years 10 months 24 days
Vested and expected to vest (in years)	5 years 4 months 24 days
Exercisable (in years)	4 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding	$ 11,063		$ 11,384
Vested and expected to vest	11,063
Exercisable	$ 9,666
Directors and Employees
Total
Outstanding, beginning balance (in shares)	1,618,231
Granted (in shares)	82,532
Exercised (in shares)	(1,000)
Forfeited (in shares)	(3,750)
Canceled (in shares)	0
Expired (in shares)	0
Outstanding, ending balance (in shares)	1,696,013
Vested and expected to vest (in shares)	1,696,013
Exercisable (in shares)	1,353,752
Non- Employees
Total
Outstanding, beginning balance (in shares)	35,415
Granted (in shares)	3,000
Exercised (in shares)	0
Forfeited (in shares)	0
Canceled (in shares)	0
Expired (in shares)	0
Outstanding, ending balance (in shares)	38,415
Vested and expected to vest (in shares)	38,415
Exercisable (in shares)	9,584