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Equity Incentive Plans and Stock-Based Compensation - 2014 Equity Incentive Plan/ESPP (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Jan. 01, 2017
Jun. 10, 2015
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for future grant (in shares)     112,431    
2014 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for future grant (in shares)     6,071,997   4,241,980
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 (in shares)     112,431   266,799
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 (in shares) 3,394,376        
2014 Stock Incentive Plan | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Additional shares reserved for future issuance (in shares)         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 (in shares)   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 (in shares)     3,579,959    
Percentage of market value     85.00%    
Percentage of eligible compensation     15.00%    
2014 Employee Stock Purchase Plan | Employee stock purchase rights          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
ESPP shares purchased during period (in shares)     524,101 552,554  
ESPP shares purchased during period (in dollars per share)     $ 6.49 $ 3.88  
Intrinsic value of ESPP shares purchased     $ 0.9 $ 1.3