Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2022

Accounting Policies [Abstract]

Schedule of Estimated Useful Lives by Asset Category

Useful lives by asset category are as follows:

Asset Category	Useful Life (in years)
Computer equipment and software	3
Furniture and fixtures	3
Laboratory equipment	5
Production equipment	5
Transportation equipment	4

Property and equipment consisted of the following (in thousands):

	April 30, 2022		April 30, 2021
Computer equipment and software	$	1,736	$	1,606
Laboratory equipment	9,521		6,603
Production equipment	15,502		5,680
Leasehold improvements	1,465		1,349
Others	524		439
Construction in progress	2,932		4,698
	$	31,680	$	20,375
Less: accumulated depreciation and amortization	(9,836)		(6,144)
	$	21,844	$	14,231