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Description of Business and Summary of Significant Accounting Policies - Fixed Assets (Details)
12 Months Ended
Jun. 30, 2017
Computer equipment  
Property Plant And Equipment [Line Items]  
Percentage of annual amortization rate on declining balance (in hundredths) 30.00%
Equipment  
Property Plant And Equipment [Line Items]  
Percentage of annual amortization rate on declining balance (in hundredths) 20.00%