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Stock Option Plans - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 0 $ 0 $ 15,000 $ 0
Common stock issued as compensation to directors, value     $ 51,000 $ 40,000
2015 Stock Incentive Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     11,540  
2015 Stock Incentive Compensation Plan [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares to be issued under stock option plan 500,000   500,000  
Number of shares issued under stock option plan     0  
Maximum percentage of shares issued     15.00%  
Shares granted     11,540  
Shares available for grant 453,658   453,658  
Unrecognized compensation expense related to nonvested share-based compensation arrangements granted $ 0   $ 0  
Directors Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares to be issued under stock option plan 74,805   74,805  
Shares granted 939 1,014 3,104 2,857
Shares available for grant 58,910   58,910  
Stock consideration on percentage of common stock received upon cash fees 110.00%   110.00%  
Common stock issued as compensation to directors, value $ 16,000 $ 15,000 $ 51,000 $ 40,000
2007 Stock Incentive Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense     500 1,000
2007 Stock Incentive Compensation Plan [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense related to nonvested share-based compensation arrangements granted $ 0 $ 1,000 $ 0 $ 1,000