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Net Income Per Share Available Loss Attributable To Common Stockholders - Summary of Outstanding Shares of Common Stock Equivalents (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share Diluted [Line Items]    
Anti-dilutive securities excluded from computation of diluted net income per share 11,095 11,435
Stock Options to Purchase Common Stock    
Earnings Per Share Diluted [Line Items]    
Anti-dilutive securities excluded from computation of diluted net income per share 11,050 11,318
Common Stock Subject to Repurchase    
Earnings Per Share Diluted [Line Items]    
Anti-dilutive securities excluded from computation of diluted net income per share 45 117