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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

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