SEGMENT INFORMATION - Summarized Financial Information of Net Revenue from External Customers by Group of Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 51,359	$ 44,354
China
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	17,965	15,966
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	12,172	10,446
Czech
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	5,760	2,767
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	5,351	5,649
Singapore
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	5,132	5,164
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 4,979	$ 4,362