Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jul. 31, 2021

Accounting Policies [Abstract]

Disaggregation of revenue

	Three Months Ended July 31,
	2021		2020
Manufacturing revenues	$	25,675	$	24,063
Process development revenues		5,079		1,329
Total revenues	$	30,754	$	25,392

Schedule of estimated useful lives of property

Description	Estimated Useful Life
Leasehold improvements	Shorter of estimated useful life or lease term
Laboratory and manufacturing equipment	5 – 10 years
Computer equipment and software	3 – 5 years
Furniture, fixtures and office equipment	5 – 10 years

Schedule of property and equipment

	July 31, 2021			April 30, 2021
Leasehold improvements	$	23,000		$	23,000
Laboratory and manufacturing equipment		21,303			20,793
Computer equipment and software		5,541			5,541
Furniture, fixtures and office equipment		843			843
Construction-in-progress		15,985			8,372
Total property and equipment, gross		66,672			58,549
Less: accumulated depreciation and amortization		(22,103	)		(21,094	)
Total property and equipment, net	$	44,569		$	37,455