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Balance Sheet Components - Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jun. 30, 2018
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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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