Balance Sheet Components - Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
VAT receivable	$ 1,639	$ 30,769
Other prepaid expenses	1,900	2,745
Prepaid insurance	1,520	939
Prepaid maintenance	587	481
Prepayments to supplier	938	583
Prepaid income tax	1,991	267
Customs deposit	163	114
Lease financing cost	0	825
Other receivables	69	379
Total other current assets	$ 8,807	$ 37,102