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Fair Value Measurement - Summary of Long-term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Fair Value Disclosures [Abstract]    
Cost $ 2,406 $ 11,406
Gross Unrealized Gains 617 436
Gross Unrealized (Losses) 0 (3)
Estimated Fair Value $ 3,023 $ 11,839