Stockholders' Equity - Stock Option Activity Under Plan (Detail) - 2008 Incentive Plan [Member] $ / shares in Units, $ in Thousands	6 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options Outstanding, Beginning balance | shares	4,447,975
Number of Options, Granted | shares	846,000
Number of Options, Exercised | shares	(215,554)
Number of Options Outstanding, Ending balance | shares	5,078,421
Number of Options,Outstanding at December 31, 2015 - vested or unvested and expected to vest | shares	4,987,765
Number of Options,Exercisable at December 31, 2015 | shares	3,305,234
Weighted Average Exercise Price Outstanding, beginning balance | $ / shares	$ 3.36
Weighted Average Exercise Price, Granted | $ / shares	4.09
Weighted Average Exercise Price, Exercised | $ / shares	1.57
Weighted Average Exercise Price Outstanding, ending balance | $ / shares	3.55
Weighted Average Exercise Price,Outstanding at December 31, 2015 - vested or unvested and expected to vest | $ / shares	3.55
Weighted Average Exercise Price,Exercisable at December 31, 2015 | $ / shares	$ 3.30
Weighted Average Remaining Contractual Life Outstanding, Ending balance	6 years 5 months 19 days
Weighted Average Remaining Contractual Life,Outstanding at December 31, 2015 - vested or unvested and expected to vest	6 years 5 months 5 days
Weighted Average Remaining Contractual Life,Exercisable at December 31, 2015	5 years 2 months 23 days
Aggregate Intrinsic Value Outstanding, Ending balance | $	$ 6,539
Aggregate Intrinsic Value, Outstanding at December 31, 2015 - vested or unvested and expected to vest | $	6,463
Aggregate Intrinsic Value, Exercisable at December 31, 2015 | $	$ 5,117