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Equity Incentive Plans and Stock-Based Compensation - 2014 Equity Incentive Plan/ESPP (Details) - shares
3 Months Ended 12 Months Ended
Jan. 01, 2017
Jun. 10, 2015
Mar. 31, 2017
Dec. 31, 2016
2014 Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for future grant     7,129,441 4,241,980
2014 Stock Incentive Plan | Prior Common Stock Outstanding        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of outstanding shares of common stock 5.00%      
Additional shares authorized for future issuance 3,394,376      
2014 Stock Incentive Plan | Reallocated 2008 Equity Plan Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for reallocation     49,000 266,799
2014 Stock Incentive Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares reserved for future issuance       8,000,000
Percentage of outstanding shares of common stock       5.00%
2014 Stock Incentive Plan | Maximum | Reallocated 2008 Equity Plan Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for reallocation   8,310,566    
2014 Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for future grant     4,104,060  
Percentage of market value     85.00%  
Percentage of eligible compensation     15.00%