| Stock Option Activity (Detail) (USD $) | 1 Months Ended | 6 Months Ended | |
|---|---|---|---|
| Feb. 28, 2013 | Oct. 29, 2012 | Dec. 31, 2012 | |
| Number of Shares | |||
| Outstanding at June 30, 2012 | 4,536,949 | ||
| Granted | 0 | ||
| Exercised | 400,000 | 100,000 | (100,000) | 
| Forfeited and cancelled | (1,021,896) | ||
| Outstanding at December 31, 2012 | 3,415,053 | ||
| Exercisable at December 31, 2012 | 2,333,219 | ||
| Weighted Average Exercise Price | |||
| Outstanding at June 30, 2012 | $ 0.17 | ||
| Outstanding at December 31, 2012 | $ 0.13 | ||
| Exercisable at December 31, 2012 | $ 0.19 | ||
| Weighted Average Remaining Contract Term (in years) | |||
| Outstanding at December 31, 2012 | 6 years 3 months 3 days | ||
| Exercisable at December 31, 2012 | 5 years 2 months 4 days | ||
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- Definition Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2 No definition available. 
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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