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Net Loss Per Share (Details) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Potentially dilutive securities
Dilutive securities excluded from the computation of diluted weighted average shares outstanding	21,016	20,515
Options to purchase common stock
Potentially dilutive securities
Dilutive securities excluded from the computation of diluted weighted average shares outstanding	20,818	20,470
Shares subject to repurchase
Potentially dilutive securities
Dilutive securities excluded from the computation of diluted weighted average shares outstanding	198	45

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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