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Stock Incentive Plan, Options and Warrants (Summary of Restricted Stock Activity and Performance Stock Units) (Detail) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock        
Summary Of Restricted Stock Activity [Line Items]        
Outstanding beginning, Other than options 195,536 258,787 410,653  
Restricted stock awards, granted in period 235,296 111,112 80,903  
Vested, Other than options (137,843) (174,363) (232,769)  
Outstanding ending, Other than options 292,989 195,536 258,787 410,653
Outstanding beginning, Weighted Average Exercise Price, Other than options $ 7.23 $ 8.45 $ 8.81  
Granted, Weighted Average Exercise Price, Other than options 1.70 3.60 5.57  
Vested, Weighted Average Grant Date Fair Value (5.25) (6.73) (8.08)  
Outstanding ending , Weighted Average Exercise Price, Other than options $ 3.72 $ 7.23 $ 8.45 $ 8.81
Nonvested, Weighted Average Remaining Vesting Period, Other Than Options, Nonvested 10 months 24 days 1 year 9 months 18 days 2 years 1 month 6 days 1 year 9 months 18 days
Performance based restricted stock        
Summary Of Restricted Stock Activity [Line Items]        
Outstanding beginning, Other than options 2,045,634 2,803,367 1,308,500  
Restricted stock awards, granted in period 785,000 716,600 2,134,100  
Vested, Other than options (350,408) (701,233) (317,833)  
Forfeited or Canceled, Other than options (260,408) (773,100) (321,400)  
Outstanding ending, Other than options 2,219,818 2,045,634 2,803,367 1,308,500
Outstanding beginning, Weighted Average Exercise Price, Other than options $ 5.83 $ 8.18 $ 10.98  
Granted, Weighted Average Exercise Price, Other than options 1.98 3.17 7.23  
Vested, Weighted Average Grant Date Fair Value (4.71) (10.97) (9.58)  
Forfeited or Canceled, Weighted Average Exercise Price, Other than options (7.32) (7.22) (11.89)  
Outstanding ending , Weighted Average Exercise Price, Other than options $ 4.47 $ 5.83 $ 8.18 $ 10.98
Nonvested, Weighted Average Remaining Vesting Period, Other Than Options, Nonvested 9 months 18 days 2 years 2 years 4 months 24 days 1 year 4 months 24 days
Restricted Stock Units (RSUs) [Member]        
Summary Of Restricted Stock Activity [Line Items]        
Outstanding beginning, Other than options 736,400 326,667 100,000  
Restricted stock awards, granted in period 2,678,743 688,836 260,000  
Vested, Other than options (1,732,523) (219,103) (33,333)  
Forfeited or Canceled, Other than options (66,667) (60,000)    
Outstanding ending, Other than options 1,615,953 736,400 326,667 100,000
Outstanding beginning, Weighted Average Exercise Price, Other than options $ 3.89 $ 8.52 $ 14.33  
Granted, Weighted Average Exercise Price, Other than options 1.77 3.18 7.03  
Vested, Weighted Average Grant Date Fair Value (2.18) (8.29) (14.33)  
Forfeited or Canceled, Weighted Average Exercise Price, Other than options (3.20) (4.89)    
Outstanding ending , Weighted Average Exercise Price, Other than options $ 2.24 $ 3.89 $ 8.52 $ 14.33
Nonvested, Weighted Average Remaining Vesting Period, Other Than Options, Nonvested 2 years 2 months 12 days 2 years 2 months 12 days 2 years 6 months 0 years