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Equity Award Plans - Summary of Activity under Stock Option Plans (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Number of shares underlying outstanding options    
Outstanding options, Beginning balance 9,291  
Granted (in shares) 672  
Exercised (in shares) (327)  
Canceled (in shares) (418)  
Outstanding options, Ending balance 9,218  
Vested and expected to vest at end of period 9,023  
Vested and exercisable (in shares) 6,091  
Options Outstanding Weighted-average exercise price    
Beginning balance (in dollars per share) $ 4.78  
Granted (in dollars per share) 5.52  
Exercised (in dollars per share) 3.69  
Canceled (in dollars per share) 6.07  
Ending balance (in dollars per share) 4.81  
Vested and expected to vest at end of period (in dollars per share) 4.80  
Vested and exercisable at end of period (in dollars per share) $ 4.40  
Weighted-average remaining contractual term 6 years 7 months 6 days 7 years
Weighted average remaining contractual term, Vested and expected to vest at end of period 6 years 7 months 6 days  
Weighted average remaining contractual term, Vested and exercisable at end of period 5 years 9 months 18 days  
Aggregate Intrinsic Value $ 19,370  
Aggregate Intrinsic Value, Vested and expected to vest at end of period 19,048  
Aggregate Intrinsic Value, Vested and exercisable at end of period $ 15,181