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Equity Incentive Plans and Stock-Based Compensation - Summary of RSU activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Aggregate Intrinsic Value (thousands) | $ $ 56,249  
Closing price (in dollars per share) $ 9.15  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding at beginning of period (in shares) | shares 5,959  
Granted (in shares) | shares 1,092  
Released (in shares) | shares (657)  
Canceled (in shares) | shares (247)  
Outstanding at end of period (in shares) | shares 6,147  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Outstanding at beginning of period (in dollars per share) $ 6.40  
Granted (in dollars per share) 9.24  
Released (in dollars per share) 5.68  
Canceled (in dollars per share) 6.78  
Outstanding at ending of period (in dollars per share) $ 5.81  
Weighted-Average Remaining Vesting Term (years) 1 year 8 months 12 days  
Vested in period (in shares) | $ $ 6,200 $ 700