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Stockholders' Equity - Incentive Plans (Detail) - USD ($)
3 Months Ended
Jan. 01, 2017
Jan. 09, 2014
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Incentive plans          
Options exercised       0  
Maximum          
Incentive plans          
Expiration period     10 years    
2003 Stock Incentive Plan          
Incentive plans          
Period from date of termination that any vested options shall expire     60 days    
Expiration period     10 years    
Intrinsic value of options exercised     $ 5,155 $ 75,093  
Cash proceeds from exercise of stock options     $ 5,478 35,891  
Options exercised     1,680    
Fair value of shares vested     $ 1,573 7,412  
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     $ 5,964,548    
Period for unrecognized compensation expense related to unvested options yet has not been recognized     2 years 7 months 6 days    
Fair value of shares vested     $ 981,460 $ 1,056,200  
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 | 2013 Equity Incentive Plan          
Authorized shares          
Common stock authorized under 2013 plan 2,837,201 1,000,000      
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