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Stockholders' Equity - Incentive Plans (Detail) - USD ($)
12 Months Ended
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
2003 Stock Incentive Plan        
Incentive plans        
Period from date of termination that any vested options shall expire   60 days    
Expiration period   10 years    
Unrecognized compensation expense related to unvested options   $ 1,382    
Intrinsic value of options exercised   97,707 $ 667,258 $ 629,232
Cash proceeds from exercise of stock options   $ 44,771 $ 114,124 $ 133,957
Options exercised   28,368 99,029 114,836
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   28,368 99,029 114,836
Fair value of shares vested   $ 16,024 $ 50,310 $ 63,865
2003 Stock Incentive Plan | Upon first anniversary of start date        
Incentive plans        
Percent of shares subject to option grant that will vest   25.00%    
2003 Stock Incentive Plan | Each month after the first anniversary        
Incentive plans        
Percent of shares subject to option grant that will vest   2.083%    
2013 Equity Incentive Plan        
Incentive plans        
Period from date of termination that any vested options shall expire   90 days    
Expiration period   10 years    
Unrecognized compensation expense related to unvested options   $ 4,308,701    
Period for unrecognized compensation expense related to unvested options yet has not been recognized   2 years    
Shares vested       0
Intrinsic value of options exercised   $ 2,275    
Cash proceeds from exercise of stock options   $ 27,825    
Options exercised   3,500 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   3,500 0 0
Fair value of shares vested   $ 3,053,086 $ 2,668,712  
2013 Equity Incentive Plan | Upon first anniversary of start date        
Incentive plans        
Percent of shares subject to option grant that will vest   25.00%    
2013 Equity Incentive Plan | Each month after the first anniversary        
Incentive plans        
Percent of shares subject to option grant that will vest   2.083%    
Common Stock        
Incentive plans        
Options exercised     110,366 157,886
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     110,366 157,886
Common Stock | 2013 Equity Incentive Plan        
Authorized shares        
Common stock authorized under 2013 plan 2,837,201      
Automatic increase in number of shares reserved for issuance as a percentage of the total common stock outstanding at the end of the prior year 3.00% 3.00%    
Maximum number of shares that may be issued pursuant to exercise of incentive stock   20,000,000    
Increase in number of shares of common stock 697,500      
Common Stock | 2013 Equity Incentive Plan | Maximum        
Authorized shares        
Common stock authorized under 2013 plan   1,000,000