Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 31,800	$ 13,458	$ 68,951	$ 38,947
United States
Disaggregation of Revenue [Line Items]
Total revenue	5,924	7,008	18,999	23,088
Mexico
Disaggregation of Revenue [Line Items]
Total revenue	2,401	2,500	6,282	5,930
Malaysia
Disaggregation of Revenue [Line Items]
Total revenue	1,134	1,483	2,257	4,867
Hong Kong
Disaggregation of Revenue [Line Items]
Total revenue	3,277	1,459	6,257	2,682
China
Disaggregation of Revenue [Line Items]
Total revenue	14,729	32	24,065	351
Singapore
Disaggregation of Revenue [Line Items]
Total revenue	2,380	0	7,342	12
Rest of the World
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,955	$ 976	$ 3,749	$ 2,017