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Stockholders' Equity - Stock Option Activity Under Plan (Detail) - 2008 Incentive Plan [Member]
$ / shares in Units, $ in Thousands
 3 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding, Beginning balance 4,447,975
Number of Options, Granted 446,000
Number of Options, Exercised (5,000)
Number of Options Outstanding, Ending balance 4,888,975
Number of Options,Outstanding at September 30, 2015 - vested and unvested and expected to vest 4,795,301
Number of Options,Exercisable at September 30, 2015 3,490,538
Weighted Average Exercise Price Outstanding, beginning balance | $ / shares $ 3.36
Weighted Average Exercise Price, Granted | $ / shares 4.09
Weighted Average Exercise Price, Exercised | $ / shares 1.81
Weighted Average Exercise Price Outstanding, ending balance | $ / shares 3.42
Weighted Average Exercise Price,Outstanding at September 30, 2015 - vested and unvested and expected to vest | $ / shares 3.41
Weighted Average Exercise Price,Exercisable at September 30, 2015 | $ / shares $ 3.19
Weighted Average Remaining Contractual Life Outstanding, Ending balance 6 years 3 months 29 days
Weighted Average Remaining Contractual Life,Outstanding at September 30, 2015 - vested and unvested and expected to vest 6 years 3 months 11 days
Weighted Average Remaining Contractual Life,Exercisable at September 30, 2015 5 years 4 months 10 days
Aggregate Intrinsic Value Outstanding, Ending balance | $ $ 2,839
Aggregate Intrinsic Value, Outstanding at September 30, 2015 - vested and unvested and expected to vest | $ 2,829
Aggregate Intrinsic Value, Exercisable at September 30, 2015 | $ $ 2,667