Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share - Schedule of potential common shares outstanding that were excluded from the computation of diluted net loss per share (Details)

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Net Loss Per Share - Schedule of potential common shares outstanding that were excluded from the computation of diluted net loss per share (Details) - shares
shares in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Anti-dilutive securities    
Total common stock equivalents (in shares) 27,443 24,444
Options to purchase common stock    
Anti-dilutive securities    
Total common stock equivalents (in shares) 10,478 12,647
Restricted stock units    
Anti-dilutive securities    
Total common stock equivalents (in shares) 16,189 11,797
Market stock units    
Anti-dilutive securities    
Total common stock equivalents (in shares) 776 0