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Loss Per Common Share - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock Options        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive Securities Excluded from Computation of Diluted Income Per Common Share 1,990,982 2,084,767 1,997,072 2,187,139