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Balance sheet information - Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]    
Accrued compensation and benefits $ 15,117 $ 13,288
Accrued royalties 9,701 21,604
Customer overpayments and related reserves 2,666 4,291
Other accrued expenses 8,726 9,716
Accrued expenses $ 36,210 $ 48,899