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Net Loss Per Share - Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 7,707 8,257 9,145
Employee Stock Options      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 5,556 6,092 7,164
Restricted Stock Units      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 2,019 1,818 1,370
ESPP      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 0 156 192
Warrants | Common Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 132 191 360
Common stock subject to repurchase or forfeiture      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 0 0 59