2. Summary of Significant Accounting Policies (Tables)

6 Months Ended

Oct. 31, 2019

Accounting Policies [Abstract]

Disaggregation of revenue

	Three Months Ended October 31,				Six Months Ended October 31,
	2019		2018		2019		2018
Manufacturing revenue	$	15,989	$	7,243	$	28,897	$	17,543
Process development revenue		2,324		2,935		4,670		5,224
Total revenues	$	18,313	$	10,178	$	33,567	$	22,767

Schedule of Restricted Cash

	October 31, 2019		April 30, 2019		October 31, 2018		April 30, 2018
Cash and cash equivalents	$	33,960	$	32,351	$	32,694	$	42,265
Restricted cash		350		1,150		1,150		1,150
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$	34,310	$	33,501	$	33,844	$	43,415

Schedule of property and equipment

	October 31, 2019			April 30, 2019
Leasehold improvements	$	21,132		$	20,574
Laboratory and manufacturing equipment		13,137			12,858
Computer equipment and software		4,719			4,644
Furniture, fixtures and office equipment		685			528
Construction-in-progress		3,334			1,590
Total property and equipment, gross	$	43,007		$	40,194
Less: accumulated depreciation and amortization		(16,017	)		(14,569	)
Total property and equipment, net	$	26,990		$	25,625