Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Detail)

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Stock-based Compensation - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 22, 2018
Jun. 22, 2017
Feb. 09, 2017
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                    
Stock option awards       128,000     105,600   128,000 105,600
Weighted-average grant date fair value       $ 1.52     $ 3.60   $ 1.52 $ 3.60
Stock options vested                 116,199  
Stock options forfeited                 0  
Number of stock options, exercised                 0  
2012 Equity Incentive Plan [Member]                    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                    
Number of additional shares authorized for issuance under an established share-based compensation plan 1,500,000                  
2012 Equity Incentive Plan [Member] | Non-employee Directors [Member]                    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                    
Stock option awards 14,000 14,000                
Exercise price $ 1.52 $ 3.70                
Annual retainer amount for the threshold of stock precluded from selling                 $ 270,000  
2012 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock [Member]                    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                    
Restricted shares awarded to each non-employee director 4,000   4,000              
Restricted shares vest in each quarter end         1,000 1,000 1,000 1,000    
Restricted shares vesting rights                 Under the Company’s 2012 Equity Incentive Plan, of which, 1,000 restricted shares vested at the end of each calendar quarter in 2017.  
2012 Equity Incentive Plan [Member] | Management [Member]                    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                    
Stock option awards 62,000 45,500                
Exercise price $ 1.52 $ 3.70                
2012 Equity Incentive Plan [Member] | Staff [Member]                    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                    
Stock option awards 10,000 4,100                
Exercise price $ 1.52 $ 3.70