CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jan. 31, 2023	Apr. 30, 2022
Current assets:
Cash and cash equivalents	$ 59,916	$ 126,166
Accounts receivable, net	14,826	20,547
Contract assets	10,388	5,369
Inventory	45,102	26,062
Prepaid expenses and other current assets	2,111	1,879
Total current assets	132,343	180,023
Property and equipment, net	164,292	92,955
Operating lease right-of-use assets	34,463	36,806
Deferred tax assets	114,580	115,082
Other assets	4,402	4,627
Restricted cash	350	350
Total assets	450,430	429,843
Current liabilities:
Accounts payable	36,392	9,504
Accrued compensation and benefits	8,400	8,418
Contract liabilities	37,750	53,798
Current portion of operating lease liabilities	3,024	2,969
Other current liabilities	1,753	1,072
Total current liabilities	87,319	75,761
Convertible senior notes, net	140,359	139,577
Operating lease liabilities, less current portion	35,659	37,886
Finance lease liabilities, less current portion	1,698	2,093
Total liabilities	265,035	255,317
Commitments and contingencies
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; 62,523 and 61,807 shares issued and outstanding at respective dates	62	62
Additional paid-in capital	615,841	605,841
Accumulated deficit	(430,508)	(431,377)
Total stockholders’ equity	185,395	174,526
Total liabilities and stockholders’ equity	$ 450,430	$ 429,843