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Leases - Composition of net lease cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Leases    
Operating lease expense $ 1,911 $ 3,762
Variable lease expense 307 631
Short-term lease expense 214 417
Total lease cost $ 2,432 $ 4,810