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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,576,451 2,658,315 2,584,502 2,616,181
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 1,186,429 1,221,445 1,182,143 1,178,144
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 169,710 216,558 182,047 217,725