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Balance Sheet Components - Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
VAT receivable	$ 30,769	$ 17,601
Other prepaid expenses	2,745	2,121
Prepaid insurance	939	906
Prepaid maintenance	481	556
Prepayments to supplier	583	227
Prepaid income tax	267	761
Customs deposit	114	5,749
Lease financing cost	825	960
Other receivables	379	670
Total other current assets	$ 37,102	$ 29,551

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