Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.7.0.1
Stock-Based Compensation - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock Based Compensation [Line Items]        
Stock based compensation expense $ 559,878 $ 611,845 $ 1,312,070 $ 980,229
Cash received from option exercises     $ 177,950  
Weighted average grant date fair value $ 2.08 $ 1.09 $ 1.39 $ 1.01
2016 Stock Plan [Member]        
Stock Based Compensation [Line Items]        
Number of shares, Options granted   0   0
Stock options vesting period     4 years  
Common stock available for grant 2,094,670   2,094,670  
Number of shares, Forfeited     217,530  
Number of shares, Options exercised 74,462   74,462  
Cash received from option exercises     $ 147,950  
Maximum term of stock options     10 years  
2016 Stock Plan [Member] | Employees Consultants And Directors [Member]        
Stock Based Compensation [Line Items]        
Number of shares, Options granted 118,367   1,258,755  
2014 Stock Plan [Member]        
Stock Based Compensation [Line Items]        
Number of shares, Options granted 0   0  
Number of shares, Forfeited     11,208  
Number of shares, Options exercised 15,000   15,000  
Cash received from option exercises     $ 30,000  
2014 Stock Plan [Member] | Employees Consultants And Directors [Member]        
Stock Based Compensation [Line Items]        
Number of shares, Options granted   88,853   1,157,734