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Stockholders' Equity - ESPP (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Jan. 01, 2017
Jan. 01, 2016
Apr. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award        
Shares of common stock reserved for future issuance (in shares) 14,904,000      
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award        
Maximum employee subscription rate, percentage of pre-tax earnings 15.00%      
Purchase price of shares, percentage of the fair market value of the Company's common stock 85.00%      
Maximum number of shares per employee per purchase period 1,500      
Shares of common stock reserved for future issuance (in shares) 1,102,224     880,000
Automatic annual increase in common stock reserved for issuance, percentage 1.00%      
Maximum annual increase of shares reserved 1,000,000      
Shares of common stock reserved for future issuance, additional shares     511,646  
Issuance of common stock under ESPP, shares 320,528      
Weighted-average price per share $ 6.17      
ESPP | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award        
Shares of common stock reserved for future issuance, additional shares   533,630