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Balance Sheet Components - Other long term assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]    
Prepayments for property and equipment $ 3,747 $ 4,846
Investment in a privately held company 100 700
Lease financing costs, noncurrent 0 1,758
Custom deposit, noncurrent 886 980
Other long-term deposits 839 889
Office lease deposit, noncurrent 1,039 1,031
Other 170 413
Other long-term assets $ 6,781 $ 10,617