Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Stock Option Plan Activity (Detail)

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Summary of Significant Accounting Policies - Summary of Stock Option Plan Activity (Detail) - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Number of Options    
Number of Options, Outstanding at Beginning of the year 112,904 267,004
Number of Options, Granted 100,000 0
Number of Options, Adjustment 10,100  
Number of Options, Forfeited (25,000)  
Number of Options, Outstanding at End of Period 198,004 267,004
Number of Options, Exercisable at End of Period 37,904 37,904
Weighted Average Exercise Price    
Weighted Average Exercise Price, Options Outstanding at Beginning of the year $ 11.11 $ 11.03
Weighted Average Exercise Price, Granted 1.00  
Weighted Average Exercise Price, Adjustment 12.50  
Weighted Average Exercise Price, Forfeited 12.50  
Weighted Average Exercise Price, Options Outstanding at End of Period 5.90 11.03
Weighted Average Exercise Price, Options Exercisable at End of Period $ 10.00 $ 10.00