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Activity Under Equity Incentive Plans Related to Stock Options (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Activity under the Company's equity incentive plans related to stock options
Number of Options Outstanding, Beginning Balance	8,504	7,362	7,007
Granted, Number of Options Outstanding	2,621	1,782	2,169
Forfeited, Number of Options Outstanding	(234)	(98)	(465)
Expired, Number of Options Outstanding	(189)	(386)	(1,237)
Exercised, Number of Options Outstanding	(297)	(156)	(112)
Number of Options Outstanding, Ending Balance	10,405	8,504	7,362
Weighted Average Exercise Price per Share
Weighted Average Exercise Price per Share, Beginning Balance	$ 3.40	$ 4.70	$ 6.42
Granted, Weighted Average Exercise Price per Share	$ 3.82	$ 3.68	$ 2.36
Forfeited, Weighted Average Exercise Price per Share	$ 3.13	$ 2.78	$ 2.45
Expired, Weighted Average Exercise Price per Share	$ 6.71	$ 30.44	$ 11.52
Exercised, Weighted Average Exercise Price per Share	$ 3.14	$ 1.30	$ 0.81
Weighted Average Exercise Price per Share, Ending Balance	$ 3.46	$ 3.40	$ 4.70

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)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ 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)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-Topic 718

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-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

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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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

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