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Consolidated Statements of Operations and Comprehensive Loss (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Income Statement [Abstract] |  |
Net unrealized losses, tax expense | $ 0 | $ 0
Reclassification adjustment for realized losses included in net loss, tax expense | $ 0 | $ 0

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