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Summary of Award Activity Under the Stock Option Plans and Changes (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012
Shares
Beginning Balance	1,903,325
Options forfeited/cancelled	(64,710)
Options exercised
Ending Balance	1,838,615
Weighted Average Exercise Price
Beginning Balance	$ 5.07
Options forfeited/cancelled	$ 8.00
Options exercised
Ending Balance	$ 4.97

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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.

+ References

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-Name Accounting Standards Codification

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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