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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%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity-based compensation costs.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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