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Stockholders' Equity - Incentive Plans (Details) - USD ($)
3 Months Ended
Jan. 01, 2019
Jan. 09, 2014
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
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     $ 129,250 $ 407,776  
Cash proceeds from exercise of stock options     $ 12,320 26,572  
Options exercised     11,000    
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     $ 14,142,362    
Period for unrecognized compensation expense related to unvested options yet has not been recognized     3 years 1 month 6 days    
Intrinsic value of options exercised     $ 23,176 535,449  
Cash proceeds from exercise of stock options     $ 18,234 272,217  
Options exercised     3,585    
Fair value of shares vested     $ 2,724,218 $ 1,193,174  
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     19,418    
Common Stock | 2013 Equity Incentive Plan          
Authorized shares          
Common stock authorized under 2013 plan 5,162,816 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 1,294,822