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Income Taxes - Significant Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Deferred tax assets:
Net operating loss carryforwards	$ 53,259	$ 47,774	$ 39,439
Deferred revenue	70	0	20
Stock-based compensation	4,788	4,241	5,107
Tax credits	3,696	3,463	1,727
Other	682	185	186
Total deferred tax assets	62,495	55,663	46,479
Deferred tax liabilities:
Intangible assets	8,207	8,542	123
Deferred tax assets, net	54,288	47,121	46,356
Valuation allowance	54,288	47,121	46,356
Total deferred tax liability	$ 0	$ 0	$ 0

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