Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Summary of Options Outstanding and Options Exercisable (Detail) (USD $)	6 Months Ended
	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding, Options Outstanding	580,004	591,672		320,842
Average Contractual Life, Options Outstanding	8 years 2 months 12 days
Average Exercise Price, Options Outstanding	$ 2.37	$ 2.48	$ 2.65	$ 2.71
Aggregate Intrinsic Value, Options Outstanding	$ 61,150
Number Outstanding, Options Exercisable	250,976
Average Remaining Contractual Life, Options Exercisable	6 years 10 months 24 days
Average Exercise Price, Options Exercisable	$ 2.96
Aggregate Intrinsic Value, Options Exercisable	19,210
Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 1.35
Range of Exercise Price, Upper Limit	$ 3.48
Number Outstanding, Options Outstanding	515,000
Average Contractual Life, Options Outstanding	8 years 9 months 18 days
Average Exercise Price, Options Outstanding	$ 1.97
Aggregate Intrinsic Value, Options Outstanding	61,150
Number Outstanding, Options Exercisable	185,972
Average Remaining Contractual Life, Options Exercisable	8 years 9 months 18 days
Average Exercise Price, Options Exercisable	$ 2.04
Aggregate Intrinsic Value, Options Exercisable	19,210
Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 3.49
Range of Exercise Price, Upper Limit	$ 5.62
Number Outstanding, Options Outstanding	50,003
Average Contractual Life, Options Outstanding	3 years 2 months 12 days
Average Exercise Price, Options Outstanding	$ 4.81
Aggregate Intrinsic Value, Options Outstanding	0
Number Outstanding, Options Exercisable	50,003
Average Remaining Contractual Life, Options Exercisable	3 years 2 months 12 days
Average Exercise Price, Options Exercisable	$ 4.81
Aggregate Intrinsic Value, Options Exercisable	0
Range Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 5.63
Range of Exercise Price, Upper Limit	$ 7.76
Number Outstanding, Options Outstanding	10,001
Average Contractual Life, Options Outstanding	2 years 8 months 12 days
Average Exercise Price, Options Outstanding	$ 7.34
Aggregate Intrinsic Value, Options Outstanding	0
Number Outstanding, Options Exercisable	10,001
Average Remaining Contractual Life, Options Exercisable	2 years 8 months 12 days
Average Exercise Price, Options Exercisable	$ 7.34
Aggregate Intrinsic Value, Options Exercisable	0
Range Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 7.77
Range of Exercise Price, Upper Limit	$ 9.90
Number Outstanding, Options Outstanding	5,000
Average Contractual Life, Options Outstanding	2 years 6 months
Average Exercise Price, Options Outstanding	$ 9.90
Aggregate Intrinsic Value, Options Outstanding	0
Number Outstanding, Options Exercisable	5,000
Average Remaining Contractual Life, Options Exercisable	2 years 6 months
Average Exercise Price, Options Exercisable	$ 9.90
Aggregate Intrinsic Value, Options Exercisable	$ 0