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Activity Under Equity Incentive Plans Related to Stock Options (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Activity under the Company's equity incentive plans related to stock options
Beginning Balance, Number of Options Outstanding	8,504
Granted, Number of Options Outstanding	2,299
Forfeited, Number of Options Outstanding	(30)
Expired, Number of Options Outstanding	(43)
Exercised, Number of Options Outstanding	(67)
Ending Balance, Number of Options Outstanding	10,663
Weighted Average Exercise Price per Share
Beginning Balance, Weighted Average Exercise Price per Share	$ 3.40
Granted, Weighted Average Exercise Price per Share	$ 3.58
Forfeited, Weighted Average Exercise Price per Share	$ 2.98
Expired, Weighted Average Exercise Price per Share	$ 7.91
Exercised, Weighted Average Exercise Price per Share	$ 2.23
Ending Balance, Weighted Average Exercise Price per Share	$ 3.43

X

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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-Publisher FASB

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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.

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Gross 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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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 could have acquired the underlying shares with respect to stock options of the plan that expired.

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