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Short-term Debt - Schedule of short-term debt (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total short-term debt | $ 22,660 | $ 116,181
Line of credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Total short-term debt | 0 | 93,246
Line of credit | Revolving Credit Facility | Bank of America |  |
Debt Instrument [Line Items] |  |
Total short-term debt | 0 | 67,346
Line of credit | Revolving Credit Facility | CTBC Bank |  |
Debt Instrument [Line Items] |  |
Total short-term debt | 0 | 25,900
Term loan | Secured debt | CTBC Bank |  |
Debt Instrument [Line Items] |  |
Total short-term debt | $ 22,660 | $ 22,935

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