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Balance Sheet Components - Other current assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jun. 30, 2021
Balance Sheet Related Disclosures [Abstract]    
VAT receivable $ 365 $ 1,539
Other prepaid expenses 2,475 1,465
Prepaid insurance 2,001 2,615
Prepaid maintenance 982 1,670
Prepayment to supplier 2,129 2,540
Prepaid income tax 2,692 2,221
Interest Receivable, Current 0 2,207
Customs deposit 0 270
Other receivables 668 68
Other Assets, Current $ 11,312 $ 14,595