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Share Based Awards (Details) - shares
3 Months Ended 12 Months Ended
Jan. 01, 2017
Jan. 01, 2016
Mar. 31, 2017
Dec. 31, 2016
Jan. 05, 2016
Dec. 20, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting period     4 years      
Shares of common stock available for issuance     27,318,528 25,088,827    
Additional shares authorized     4,453,425      
Employees Stock Purchase Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Maximum percentage of employee base compensation that may be utilized to purchase common stock under the ESPP     15.00%      
Percentage of purchase price of common stock at fair market value     85.00%      
2008 Stock Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Expiry term of exercisable options     10 years      
2014 Equity Incentive Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares of common stock, authorized for issuance     8,142,857      
Maximum annual percentage increase in shares issuable     5.00%      
Additional shares authorized   4,453,425        
2015 Inducement Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares of common stock, authorized for issuance           1,600,000
Shares of common stock available for issuance         1,970,000  
2015 Inducement Plan | Incentive Stock Options            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares outstanding under the 2015 Inducement Plan     1,751,667      
2015 Inducement Plan | RSUs            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares outstanding under the 2015 Inducement Plan     1,751,667      
2014 Employee Stock Purchase Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Maximum annual percentage increase in shares issuable     1.00%      
Additional shares authorized as a percentage of capital stock outstanding       1.00%    
Maximum increase in shares issuable     2,142,857      
2014 Employee Stock Purchase Plan | Employees Stock Purchase Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares of common stock available for issuance     673,449 575,974    
Additional shares authorized 890,685          
Minimum | 2008 Stock Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Options granted, exercisable term     3 years      
Maximum | 2008 Stock Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Options granted, exercisable term     4 years      
Maximum | 2014 Equity Incentive Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares of common stock available for issuance     16,312,202