CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2022	Apr. 30, 2021
Current assets:
Cash and cash equivalents	$ 126,166	$ 169,915
Accounts receivable, net	20,547	18,842
Contract assets	5,369	6,112
Inventory	26,062	11,871
Prepaid expenses	1,879	1,064
Total current assets	180,023	207,804
Property and equipment, net	92,955	37,455
Operating lease right-of-use assets	36,806	18,691
Deferred tax assets	115,082	0
Other assets	4,627	1,210
Restricted cash	350	350
Total assets	429,843	265,510
Current liabilities:
Accounts payable	9,504	9,257
Accrued compensation and benefits	8,418	8,794
Contract liabilities	53,798	50,769
Current portion of operating lease liabilities	2,969	1,355
Other current liabilities	1,072	761
Total current liabilities	75,761	70,936
Convertible senior notes, net	139,577	96,949
Operating lease liabilities, less current portion	37,886	19,889
Finance lease liabilities, less current portion	2,093	0
Total liabilities	255,317	187,774
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000 shares authorized; no shares issued and outstanding at respective dates	0	0
Common stock, $0.001 par value; 150,000 shares authorized; 61,807 and 61,069 shares issued and outstanding at respective dates	62	61
Additional paid-in capital	605,841	637,534
Accumulated deficit	(431,377)	(559,859)
Total stockholders’ equity	174,526	77,736
Total liabilities and stockholders’ equity	$ 429,843	$ 265,510