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Balance Sheet Components - Other current assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018
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Balance Sheet Related Disclosures [Abstract] |  |
VAT receivable | $ 25,722 | $ 17,601
Other prepaid expenses | 2,417 | 2,121
Prepaid Insurance | 1,109 | 906
Prepaid Maintenance, Current | 685 | 556
Prepayment to supplier | 735 | 227
Prepaid income tax | 761 | 761
Customs deposit | 26 | 5,749
Lease Financing Costs, Current | 910 | 960
Other receivable | 390 | 670
Other Assets, Current | $ 32,755 | $ 29,551

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