Net Loss per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Basic and diluted
Net loss	$ (115,344)	$ (83,862)	$ (85,302)
Weighted-average shares of common stock outstanding	84,493	72,103	63,084
Less: unvested RSAs	(2,442)	(33)	(57)
Weighted-average shares used in computing basic net loss per common share	82,051	72,070	63,027
Weighted-average shares used in computing diluted net loss per common share	82,051	72,070	63,027
Basic and diluted net loss per common share (in dollars per share)	$ (1.41)	$ (1.16)	$ (1.35)
Securities that could potentially dilute basic EPS in the future
Anti-dilutive securities (in shares)	12,132	13,304	13,758
Stock options
Securities that could potentially dilute basic EPS in the future
Anti-dilutive securities (in shares)	4,610	5,823	6,646
RSUs AND RSAs
Securities that could potentially dilute basic EPS in the future
Anti-dilutive securities (in shares)	854	813	444
Convertible debt
Securities that could potentially dilute basic EPS in the future
Anti-dilutive securities (in shares)	6,668	6,668	6,668

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-URI http://asc.fasb.org/extlink&oid=6508534

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

+ References

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+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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+ Details