Stockholders' Equity - Stock Option Activity Under Plan (Detail) - 2008 Incentive Plan [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options Outstanding, Beginning balance | shares	4,981,421
Number of Options, Granted | shares	1,105,300
Number of Options, Exercised | shares	(4,080)
Number of Options Forfeited | shares	(302,250)
Number of Options Outstanding, Ending balance | shares	5,780,391
Number of Options, Outstanding at September 30, 2016 - vested and unvested and expected to vest | shares	5,655,685
Number of Options, Exercisable at September 30, 2016 | shares	4,091,157
Weighted Average Exercise Price Outstanding, beginning balance | $ / shares	$ 3.60
Weighted Average Exercise Price, Granted | $ / shares	3.58
Weighted Average Exercise Price, Exercised | $ / shares	2.14
Weighted Average Exercise Price,Forfeited | $ / shares	4.18
Weighted Average Exercise Price Outstanding, ending balance | $ / shares	3.57
Weighted Average Exercise Price, Outstanding at September 30, 2016 - vested and unvested and expected to vest | $ / shares	3.56
Weighted Average Exercise Price, Exercisable at September 30, 2016 | $ / shares	$ 3.48
Weighted Average Remaining Contractual Life Outstanding, Ending balance	5 years 1 month 17 days
Weighted Average Remaining Contractual Life, Outstanding at September 30, 2016 - vested and unvested and expected to vest	5 years 15 days
Weighted Average Remaining Contractual Life, Exercisable at September 30, 2016	3 years 5 months 5 days
Aggregate Intrinsic Value Outstanding, Ending balance | $	$ 1,213
Aggregate Intrinsic Value, Outstanding at September 30, 2016 - vested and unvested and expected to vest | $	1,213
Aggregate Intrinsic Value, Exercisable at September 30, 2016 | $	$ 1,213