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Stock-based Compensation (Summary of Restricted Stock Activity and Performance Stock Units) (Detail) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Restricted Stock    
Summary Of Restricted Stock Activity [Line Items]    
Outstanding beginning, Other than options 292,989  
Outstanding ending, Other than options 292,989 292,989
Outstanding beginning, Weighted Average Exercise Price, Other than options $ 3.72  
Outstanding ending , Weighted Average Exercise Price, Other than options $ 3.72 $ 3.72
Nonvested, Weighted Average Remaining Vesting Period, Other Than Options, Nonvested 7 months 6 days 10 months 24 days
Performance based restricted stock    
Summary Of Restricted Stock Activity [Line Items]    
Outstanding beginning, Other than options 2,219,818  
Vested, Other than options (289,671)  
Forfeited or Canceled, Other than options (26,179)  
Outstanding ending, Other than options 1,903,968 2,219,818
Outstanding beginning, Weighted Average Exercise Price, Other than options $ 4.47  
Vested, Weighted Average Grant Date Fair Value (4.68)  
Forfeited or Canceled, Weighted Average Exercise Price, Other than options (5.14)  
Outstanding ending , Weighted Average Exercise Price, Other than options $ 4.43 $ 4.47
Nonvested, Weighted Average Remaining Vesting Period, Other Than Options, Nonvested 1 year 1 month 6 days 9 months 18 days
Restricted Stock Units (RSUs) [Member]    
Summary Of Restricted Stock Activity [Line Items]    
Outstanding beginning, Other than options 1,615,953  
Vested, Other than options (168,063)  
Forfeited or Canceled, Other than options (16,667)  
Outstanding ending, Other than options 1,431,223 1,615,953
Outstanding beginning, Weighted Average Exercise Price, Other than options $ 2.24  
Vested, Weighted Average Grant Date Fair Value (2.38)  
Forfeited or Canceled, Weighted Average Exercise Price, Other than options (1.76)  
Outstanding ending , Weighted Average Exercise Price, Other than options $ 2.23 $ 2.24
Nonvested, Weighted Average Remaining Vesting Period, Other Than Options, Nonvested 1 year 10 months 24 days 2 years 2 months 12 days