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Activity Under Equity Incentive Plans Related to Stock Options (Detail) shares in Thousands	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Activity under the Company's equity incentive plans related to stock options
Number of Options Outstanding, Beginning Balance | shares	11,323
Granted, Number of Options Outstanding | shares	3,628
Forfeited, Number of Options Outstanding | shares	(155)
Expired, Number of Options Outstanding | shares	(41)
Exercised, Number of Options Outstanding | shares	(308)
Number of Options Outstanding, Ending Balance | shares	14,447
Weighted Average Exercise Price per Share
Weighted Average Exercise Price per Share, Beginning Balance	$ 4.13
Granted, Weighted Average Exercise Price per Share	4.57
Forfeited, Weighted Average Exercise Price per Share	4.73
Expired, Weighted Average Exercise Price per Share	6.57
Exercised, Weighted Average Exercise Price per Share	2.91
Weighted Average Exercise Price per Share, Ending Balance	$ 4.25

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(1)(iv)(4)



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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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Number of options outstanding, including both vested and non-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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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