Supplemental Financial Information (Tables)

12 Months Ended

Apr. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Inventories

Inventories consisted of the following (in thousands):

	April 30, 2022		April 30, 2021
Raw materials	$	11,610	$	2,177
Work in process	10,352		1,844
Finished goods	5,375		3,083
	$	27,337	$	7,104

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	April 30, 2022		April 30, 2021
Prepaid expenses	$	4,477	$	1,313
Advances to suppliers	188		6,276
Other current assets	1,258		1,142
	$	5,923	$	8,731

Schedule of Property, Plant and Equipment

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

Schedule of Other Non-current Assets

Other non-current assets consisted of the following (in thousands):

	April 30, 2022		April 30, 2021
Non-current contract assets	$	983	$	1,819
Other non-current assets	3,731		1,641
	$	4,714	$	3,460

Schedule of Accrued Expenses

Accrued expenses and other current liabilities consisted of the following (in thousands):

	April 30, 2022		April 30, 2021
Accrued expenses	$	8,372	$	2,652
Current portion of operating lease liabilities	2,379		—
Income tax payable	1,312		625
	$	12,063	$	3,277

Schedule of Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	April 30, 2022		April 30, 2021
Accrued expenses	$	8,372	$	2,652
Current portion of operating lease liabilities	2,379		—
Income tax payable	1,312		625
	$	12,063	$	3,277