Balance Sheet Components - Other long term assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Prepayments for property and equipment	$ 6,040	$ 17,599
Investment in a privately held company	700	700
Lease financing costs, noncurrent	1,987	1,922
VAT long-term receivable	0	3,396
Custom deposit, noncurrent	1,220	1,589
Other long-term deposits	909	2,252
Office lease deposit, noncurrent	991	853
Other	412	387
Other long-term assets	$ 12,259	$ 28,698