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Income Taxes - Reconciliation Between Statutory Federal Income Tax and Company's Effective Tax Rates as Percentage of Loss Before Income Taxes (Detail)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]      
Federal tax rate 34.00% 34.00% 34.00%
States taxes, net of federal benefit 14.50% 7.70% 5.80%
Foreign rate differential (0.30%) (1.10%) (1.10%)
Stock-based compensation expense (23.90%) (15.70%) (13.30%)
Change in valuation allowance (18.70%) (25.20%) (25.00%)
Research and development credits 2.50% 2.70% 1.60%
Other 0.00% (3.10%) (0.80%)
Effective income tax rate 8.10% (0.70%) 1.20%