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Loss Per Common Share - Antidilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Common Share (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,560,737 2,633,480 2,586,242 2,595,114
Series E Redeemable Preferred Stock [Member] | Embedded Derivative [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 303,646 303,646 303,646 303,646
Convertible Preferred Stocks [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 916,666 916,666 916,666 916,666
Restricted Stock and Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,160,116 1,195,560 1,177,715 1,156,493
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 180,309 217,608 188,215 218,309