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Stock Based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
May 31, 2018
shares
Jan. 31, 2019
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
May 28, 2014
event
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock options outstanding (in shares) | shares     1,180,000 1,202,000 1,222,000  
Number of options granted (in shares) | shares     0 0    
Options, intrinsic value, vested     $ 0 $ 0    
Options, intrinsic value, unvested     0 0    
Options, intrinsic value, exercised     0 0    
Unrecognized stock-based compensation expense for stock options     0      
Stock-based compensation, tax benefit     0 0    
Compensation costs capitalized as part of the cost of an asset     0 0    
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option compensation expense     $ 0 $ 18,000    
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested restricted shares outstanding (in shares) | shares     113,000 341,000 363,000  
Stock option compensation expense     $ 15,000 $ 58,000    
Shares withheld and repurchased to satisfy tax obligations (in shares) | shares     78,000      
Tax obligations relating to the vesting of shares     $ 20,000      
Unrecognized stock-based compensation expense for other than options     140,000      
Unrecognized stock-based compensation expense for other than options, to be expenses upon change in control     $ 137,000      
Weighted average period for amortization of unrecognized stock-based compensation     6 months      
Time-based Restricted Stock Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense for other than options     $ 3,000      
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, restricted shares (in shares) | shares     4,878,000      
Unvested restricted shares outstanding (in shares) | shares     5,035,000 1,752,000 3,196,000  
Stock option compensation expense     $ 350,000 $ 382,000    
Shares withheld and repurchased to satisfy tax obligations (in shares) | shares     174,000      
Tax obligations relating to the vesting of shares     $ 47,000      
Unrecognized stock-based compensation expense for other than options     $ 624,000      
Stock-based compensation arrangement, vested in period, remain outstanding (in shares) | shares     988,000 988,000    
Time-based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested restricted shares outstanding (in shares) | shares     592,000      
Unrecognized stock-based compensation expense for other than options     $ 44,000      
Weighted average period for amortization of unrecognized stock-based compensation     8 months      
Performance-based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested restricted shares outstanding (in shares) | shares     4,443,000      
Unrecognized stock-based compensation expense for other than options     $ 580,000      
2014 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant (in shares) | shares     531,000     4,400,000
Additional shares available for issuance (in shares) | shares 3,000,000          
Awards granted in period (in shares) | shares     4,878,000      
2014 Equity Incentive Plan | RSUs | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, restricted shares (in shares) | shares   530,000        
2007 Stock Incentive Plan | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock options outstanding (in shares) | shares     1,180,000      
2007 Stock Incentive Plan | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested restricted shares outstanding (in shares) | shares     113,000      
Minimum | 2014 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of events to occur to permit granting (or more) | event           1