2. Summary of Significant Accounting Policies (Tables)

9 Months Ended

Jan. 31, 2021

Accounting Policies [Abstract]

Disaggregation of revenue

The following table summarizes our manufacturing and process development revenue streams (in thousands):

	Three Months Ended January 31,				Nine Months Ended January 31,
	2021		2020		2021		2020
Manufacturing revenues	$	17,895	$	11,525	$	60,407	$	40,422
Process development revenues		3,911		2,060		7,855		6,730
Total revenues	$	21,806	$	13,585	$	68,262	$	47,152

Schedule of estimated useful lives of property

Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets, which are generally as follows:

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

Schedule of property and equipment

All of our property and equipment are located in the U.S. Property and equipment consist of the following (in thousands):

	January 31, 2021			April 30, 2020
Leasehold improvements	$	21,230		$	21,130
Laboratory and manufacturing equipment		16,094			15,033
Computer equipment and software		5,541			5,334
Furniture, fixtures and office equipment		715			685
Construction-in-progress		8,763			2,564
Total property and equipment, gross	$	52,343		$	44,746
Less: accumulated depreciation and amortization		(20,181	)		(17,641	)
Total property and equipment, net	$	32,162		$	27,105