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Fair Value Measurement - Cash and Short term Investments (Details) - Short-term Investments - Corporate Bond Securities - USD ($)
$ in Thousands
Mar. 31, 2017
Jun. 30, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost $ 2,406 $ 11,406
Gross Unrealized Gains 294 436
Gross Unrealized (Losses) (2) (3)
Estimated Fair Value $ 2,698 $ 11,839