Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plan - Additional Information (Detail)

v3.19.1
Stock Compensation Plan - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jun. 22, 2018
shares
Jan. 08, 2018
$ / shares
Dec. 01, 2017
Dec. 31, 2017
$ / shares
shares
May 31, 2017
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Apr. 06, 2018
$ / shares
Dec. 31, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock par value | $ / shares   $ 0.001   $ 0.001   $ 0.001 $ 0.001 $ 0.001  
Stock issued during period shares reverse stock splits ratio   0.10              
Effective date of common stock split   Jan. 19, 2018              
Number of stock options outstanding       260,633   1,812,133 260,633   162,153
Expiration period           10 years      
Unrecognized compensation costs | $           $ 496,448      
Weighted average period over which unrecognized compensation costs are expected to be recognized           1 year 1 month 6 days      
Total grant date fair value of options vested | $           $ 652,885 $ 445,589    
Stock Options [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock-based compensation expense | $           $ 996,038 $ 435,218    
Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock issued during period shares reverse stock splits ratio     0.2            
Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock issued during period shares reverse stock splits ratio     0.1            
Shares vesting period           3 years      
2012 Equity Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of additional shares authorized for issuance under an established share-based compensation plan 1,500,000     2,000,000 1,500,000        
Shares authorized under the incentive plan, before amendment       5,500,000 4,000,000   5,500,000    
Shares authorized under the incentive plan 2,250,000     7,500,000 5,500,000   7,500,000    
Maximum number of shares per individual per calendar year 1,000,000                
Shares issued under the 2012 Incentive Plan to date           240,750      
Common shares available for issuance under 2012 incentive plan           2,009,250      
Number of stock options outstanding           1,812,133      
Stock option awards available for future grant           197,117