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
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Number of Options    
Number of Options, Outstanding at Beginning of the year 11,290 26,700
Number of Options, Granted 10,000 0
Number of Options, Adjustment 1,010  
Number of Options, Forfeited (2,500)  
Number of Options, Outstanding at End of Period 19,800 26,700
Number of Options, Exercisable at End of Period 3,790 3,790
Weighted Average Exercise Price    
Weighted Average Exercise Price, Options Outstanding at Beginning of the year $ 111.10 $ 110.30
Weighted Average Exercise Price, Granted 10.00  
Weighted Average Exercise Price, Adjustment 125.00  
Weighted Average Exercise Price, Forfeited 125.00  
Weighted Average Exercise Price, Options Outstanding at End of Period 62.13 110.30
Weighted Average Exercise Price, Options Exercisable at End of Period $ 107.64 $ 100.00