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Stock-based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Feb. 20, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2016
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Warrants              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense   $ 0 $ 0   $ 0 $ 0  
Unvested shares   0     0    
Stock Appreciation Rights (SARs) [Member] | Employees and Consultants [Member] | Share-based Compensation Award, Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense         $ 100,000 700,000  
Performance based restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense   $ 0 200,000   $ 200,000 800,000  
Unvested shares   1,418,656     1,418,656   2,219,818
Performance based restricted stock | Years Ended December 31, 2016 - 2018 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense         $ 200,000    
Number of shares vested         231,396    
Performance based restricted stock | Employees and Consultants [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense           500,000  
Restricted stock awards, granted in period 208,883            
Performance based restricted stock | Employees [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted, Options         135,000    
Grant date fair value of stock units granted         $ 300,000    
Performance based restricted stock | Employees [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period         1 year    
Performance based restricted stock | Employees [Member] | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period         2 years    
Performance based restricted stock | Employee [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense     200,000     $ 200,000  
Restricted stock awards, granted in period           200,000  
Award vesting period           2 years  
Shares issued under stock incentive plan (in shares)           83,250  
Granted, Options           200,000  
Grant date fair value of stock units granted           $ 500,000  
Performance based restricted stock | Consultant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock awards, granted in period           250,000  
Award vesting period           5 years  
Grant date fair value of stock units granted           $ 500,000  
Unvested restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense   $ 100,000 100,000   $ 300,000 400,000  
Unrecognized compensation expense, other than options   $ 300,000     $ 300,000    
Unrecognized compensation expense, period for recognition         9 months 18 days    
Restricted stock awards, granted in period         464,576    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 0.86    
Unvested shares   522,269     522,269   292,989
Unvested restricted stock | Board of Directors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock granted, value, share-based compensation, gross         $ 400,000 400,000  
Unvested restricted stock | Restricted Time-Based Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense   $ 100,000     200,000    
Unvested restricted stock | Restricted Time-Based Units [Member] | Board of Directors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense     100,000   $ 100,000 $ 200,000  
Restricted stock awards, granted in period           235,296  
Award vesting period       1 year      
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested shares   1,001,371     1,001,371   1,615,953
Restricted Stock Units (RSUs) [Member] | Chief Financial Officer And Former Chief Financial Officer And Chief Executive Officer And Employees And Consultants [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense         $ 700,000 $ 1,400,000  
Unrecognized compensation expense, other than options   $ 900,000     $ 900,000    
Unrecognized compensation expense, period for recognition         1 year 3 months 18 days    
Restricted Stock Units (RSUs) [Member] | Chief Financial Officer And Former Chief Financial Officer And Chief Executive Officer And Employees And Consultants [Member] | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense   100,000 400,000        
Restricted Stock Units (RSUs) [Member] | Employees and Consultants [Member] | Share-based Compensation Award, Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense     200,000        
Grant date fair value of stock units granted           $ 3,000,000  
Restricted Stock Units (RSUs) [Member] | Employees and Consultants [Member] | Share-based Compensation Award, Tranche One [Member] | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period           5 years  
Restricted Stock Units (RSUs) [Member] | Employees [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock awards, granted in period           1,635,257  
Restricted Stock Units (RSUs) [Member] | Employee [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock awards, granted in period           843,486  
Employee Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense   0 $ 0   $ 0 $ 0  
Unrecognized compensation expense, options   $ 0     $ 0    
Nonvested options   0     0    
Warrants [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation expense, other than options   $ 0     $ 0    
Granted, Options