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Equity Award Plans - Summary of Activity under Stock Option Plans (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Number of shares underlying outstanding options        
Outstanding options, Beginning balance     11,084  
Granted (in shares) 0 0 408  
Exercised (in shares)     (535)  
Canceled (in shares)     (922)  
Outstanding options, Ending balance 10,035   10,035  
Vested and expected to vest at end of period 9,633   9,633  
Vested and exercisable (in shares) 5,592   5,592  
Options Outstanding Weighted-average exercise price        
Beginning balance (in dollars per share)     $ 5.18  
Granted (in dollars per share)     4.84  
Exercised (in dollars per share)     2.93  
Canceled (in dollars per share)     7.27  
Ending balance (in dollars per share) $ 5.10   5.10  
Vested and expected to vest at end of period (in dollars per share) 5.06   5.06  
Vested and exercisable at end of period (in dollars per share) $ 4.27   $ 4.27  
Weighted-average remaining contractual term     7 years 4 months 24 days 7 years 10 months 24 days
Weighted average remaining contractual term, Vested and expected to vest at end of period     7 years 3 months 18 days  
Weighted average remaining contractual term, Vested and exercisable at end of period     6 years 3 months 18 days  
Aggregate Intrinsic Value $ 17,394   $ 17,394  
Aggregate Intrinsic Value, Vested and expected to vest at end of period 16,950   16,950  
Aggregate Intrinsic Value, Vested and exercisable at end of period $ 13,179   $ 13,179