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Equity Award Plans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 28, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Reserved shares of Common Stock   14,281,000 12,925,000    
Intrinsic value of options exercised   $ 328 $ 2,935 $ 5,615  
Estimated fair value of share options vested   $ 5,424 $ 7,573 $ 5,447  
2013 Employee Stock Purchase Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Reserved shares of Common Stock   1,190,000 776,000   1,000,000
Percentage of shares outstanding under Equity Award Plan   1.00%      
Percentage of fair market value of common stock of lesser   85.00%      
Shares issued under 2013 ESPP   292,000 257,000    
Number of shares reserved under Employee Stock Purchase Plan   700,000      
Equity Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock options, vest period   10 years      
Subsequent Event [Member] | 2013 Employee Stock Purchase Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Increase in common stock available for issuance 388,000        
Employee Stock Plan 2006 Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock options, vest period   10 years      
Repurchase of common stock   3,000 18,000    
Long-term liability   $ 41 $ 249    
2013 Equity Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Reserved shares of Common Stock         4,500,000
Percentage of shares outstanding under Equity Award Plan   5.00%      
2013 Equity Incentive Plan [Member] | Subsequent Event [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Increase in common stock available for issuance 1,940,000        
Reason Other Than Disability or Death [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Exercise period of options   3 months      
Due to Disability or Death [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Exercise period of options   12 months