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Net Loss per Share (Details) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Anti-dilutive securities
Anti-dilutive securities (in shares)	20,290	18,287
Stock options
Anti-dilutive securities
Anti-dilutive securities (in shares)	4,500
RSUs
Anti-dilutive securities
Anti-dilutive securities (in shares)	600
Unvested RSAs
Anti-dilutive securities
Anti-dilutive securities (in shares)	1,200
Outstanding options and awards granted under equity incentive plan and ESPP
Anti-dilutive securities
Anti-dilutive securities (in shares)	5,866	5,747
Unvested RSAs
Anti-dilutive securities
Anti-dilutive securities (in shares)	1,930	2,193
Shares issuable upon conversion of convertible subordinated notes
Anti-dilutive securities
Anti-dilutive securities (in shares)	12,494	10,347

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.

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