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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jun. 30, 2021
Inventories    
Component parts $ 20,851 $ 17,929
Work-in-process 7,162 6,158
Finished product 9,717 8,355
Inventory, net of reserves 37,730 32,442
Current 29,814 25,278
Non-current 7,916 7,164
Total Inventory $ 37,730 $ 32,442