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Balance Sheet Components - Other current assets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jun. 30, 2017
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Balance Sheet Related Disclosures [Abstract] |  |
VAT receivable | $ 12,979 | $ 591
Other prepaid expenses | 2,438 | 2,171
Prepayment to supplier | 611 | 148
Prepaid income tax | 536 | 1,356
Other receivable | 551 | 617
Other Assets, Current | $ 17,115 | $ 4,883

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