Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Prepaid Expense and Other Current Assets [Abstract]
Other receivables	$ 40,417	$ 94,859
Prepaid income tax	13,846	14,323
Prepaid expenses	5,832	7,075
Deferred service costs	4,431	4,161
Restricted cash	250	250
Others	17,955	6,317
Total prepaid expenses and other current assets	82,731	126,985
Receivables from contract manufacturers, buy-sell arrangement	$ 33,600	$ 83,800