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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - Fair Value, Measurements, Recurring - USD ($)
Jun. 30, 2017
Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 1,911,170 $ 5,874,258
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 1,911,170