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Summary of Stock Option Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012
Number of shares outstanding
Beginning Balance	20,089,216
Granted
Exercised
Expired or Forfeited	(3,412,676)
Ending Balance	16,676,540
Weighted Average Exercise Price
Beginning Balance	$ 0.1301
Granted
Exercised
Expired/Forfeited	$ 0.1629
Ending Balance	$ 0.1247
Options Outstanding, Price per Share Range
Beginning Balance, lower limit	$ 0.0061
Beginning Balance, upper limit	$ 0.2334
Granted, lower limit
Granted, upper limit
Exercised, lower limit
Exercised, upper limit
Expired or Forfeited, lower limit	$ 0.0015
Expired or Forfeited, upper limit	$ 0.2334
Ending Balance, lower limit	$ 0.0061
Ending Balance, upper limit	$ 0.2334

X

- 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.

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Net number of share options (or share units) granted during the period.

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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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