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Net Loss per Share (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Securities that could potentially dilute basic EPS in the future
Anti-dilutive securities (in shares)	20,340	9,239	14,536
Equity incentive plans and ESPP
Securities that could potentially dilute basic EPS in the future
Anti-dilutive securities (in shares)	6,239	4,095	5,367
RSAs
Securities that could potentially dilute basic EPS in the future
Anti-dilutive securities (in shares)	1,772	2,364	2,501
Convertible subordinated notes
Securities that could potentially dilute basic EPS in the future
Anti-dilutive securities (in shares)	12,329	2,780	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.

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