SEGMENT INFORMATION - Summarized Financial Information of Net Revenue from External Customers by Group of Services (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 51,548	$ 49,434	$ 150,223	$ 178,552
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	13,183	13,295	37,336	46,195
China
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	17,859	15,220	53,248	57,269
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	6,180	6,149	18,056	19,331
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 14,326	$ 14,770	$ 41,583	$ 55,757