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Convertible Preferred Stock (Details)
$ in Thousands
3 Months Ended
Mar. 29, 2016
shares
Mar. 31, 2016
USD ($)
item
shares
Dec. 31, 2015
USD ($)
shares
Nov. 26, 2014
shares
Convertible Preferred Stock        
Number of classes of stock authorized | item   2    
Convertible preferred stock        
Shares Authorized   0 14,274,741  
Shares Issued   0 14,274,741  
Shares Outstanding   0 14,274,741  
Net Carrying Value | $     $ 125,780  
Liquidation Value | $   $ 0 $ 108,500  
Conversion        
Number of common stock issued with the conversion of the preferred stock 14,274,741      
Preferred stock conversion ratio 1      
Series A convertible preferred stock        
Convertible preferred stock        
Shares Authorized     8,921,429 8,921,438
Shares Issued     8,921,429  
Net Carrying Value | $     $ 50,941  
Liquidation Value | $     $ 33,500  
Series B convertible preferred stock        
Convertible preferred stock        
Shares Authorized     5,353,312  
Shares Issued     5,353,312  
Net Carrying Value | $     $ 74,839  
Liquidation Value | $     $ 75,000