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Stock Options - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average grant-date fair value of options granted $ 6.21   $ 1.23
Stock options vested aggregate intrinsic value $ 6,470,698   $ 7,770,086
Stock options expected to vest aggregate intrinsic value 4,942,466   4,569,243
Stock-based compensation 73,475 $ 28,893  
Total unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans $ 471,071   $ 522,818
Unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans, period for recognition 3 years    
Restricted Stock | Chief Financial Officer And Chief Operating Officer      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted common stock granted     57,475
Fair value of common stock granted, per share     $ 2.00
Vested percentage of common stock     100.00%
Vested period of restricted common stock     6 months
Shares vested month and year 2017-02    
Stock-based compensation $ 53,056   $ 61,894