SEGMENT INFORMATION - Summarized Financial Information of Net Revenue from External Customers by Group of Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 50,781	$ 54,322	$ 102,140	$ 98,676
Mainland China
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	16,231	19,424	34,196	35,390
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	13,173	13,707	25,345	24,153
Czech
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	7,535	3,990	13,295	6,757
Singapore
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	5,102	4,752	10,234	9,916
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	4,926	6,227	10,277	11,876
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 3,814	$ 6,222	$ 8,793	$ 10,584