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Equity and Stock-Based Compensation (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
May 25, 2021
USD ($)
May 11, 2021
USD ($)
shares
Apr. 21, 2021
shares
Feb. 04, 2021
USD ($)
day
shares
Dec. 04, 2019
USD ($)
Mar. 31, 2021
USD ($)
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2020
$ / shares
Dec. 11, 2017
USD ($)
Dec. 05, 2017
USD ($)
$ / shares
Class of Stock [Line Items]                            
Dividends declared               $ 0 $ 0 $ 0 $ 0      
Fair value of common stock issued               $ 47,268,000   $ 65,577,000        
Common stock, par value (in dollars per share) | $ / shares $ 0.01             $ 0.01   $ 0.01   $ 0.01    
Restricted Stock Units (RSUs)                            
Class of Stock [Line Items]                            
Units granted (in shares) | shares     215,000       504,000              
Fair value of units granted     $ 1,500,000       $ 3,500,000              
Vesting period (in years)     3 years       3 years              
Performance Shares                            
Class of Stock [Line Items]                            
Units granted (in shares) | shares     446,000                      
Fair value of units granted     $ 6,000,000.0                      
Vesting period (in years)     3 years                      
Award service period (in years)                   3 years        
Performance Shares | 2021 Grants                            
Class of Stock [Line Items]                            
Vesting period (in years)                   3 years        
Performance Shares | Minimum | 2019 and 2020 Grants                            
Class of Stock [Line Items]                            
Award performance target (as a percent)                   0.00%        
Performance Shares | Minimum | 2021 Grants                            
Class of Stock [Line Items]                            
Award performance target (as a percent)                   0.00%        
Performance Shares | Maximum | 2019 and 2020 Grants                            
Class of Stock [Line Items]                            
Award performance target (as a percent)                   200.00%        
Performance Shares | Maximum | 2021 Grants                            
Class of Stock [Line Items]                            
Award performance target (as a percent)                   200.00%        
Private Placement | YA                            
Class of Stock [Line Items]                            
Shares sold (in shares) | shares               500,000   1,700,000        
Proceeds received               $ 2,993,000   $ 10,000,000        
Shares authorized (in shares) | shares         7,780,786                  
Anniversary of agreement (in months)         36 months                  
Percentage of the Market Price         95.00%                  
Ownership threshold (as a percent)         4.99%                  
Consecutive trading days after advance notice | day         5                  
Maximum advance shares (in shares) | shares         1,200,000                  
Price per share percentage of average daily VWAP         100.00%                  
Consecutive trading days prior to advance notice | day         5                  
Structuring fee         $ 10,000                  
Private Placement | Lincoln Park                            
Class of Stock [Line Items]                            
Shares sold (in shares) | shares       15,000       781,000   781,000        
Proceeds received               $ 4,217,000   $ 4,217,000        
Shares authorized (in shares) | shares       8,893,565                    
Equity Distribution Agreements                            
Class of Stock [Line Items]                            
Maximum offering price           $ 40,000,000.0                
Shares sold (in shares) | shares               5,972,000   5,972,000        
Proceeds received               $ 36,213,000   $ 36,213,000        
Percentage of the gross sales price           2.00%                
Equity Distribution Agreements | Virtu                            
Class of Stock [Line Items]                            
Maximum offering price   $ 50,000,000                        
Percentage of the gross sales price   0.01%                        
Common Stock                            
Class of Stock [Line Items]                            
Common shares issued (in shares) | shares               7,959,000   11,164,000        
Fair value of common stock issued               $ 80,000   $ 112,000        
Shares of stock repurchased during period (in shares) | shares                 15,000 50,000 35,000      
Common Stock | Director                            
Class of Stock [Line Items]                            
Common shares issued (in shares) | shares     46,000                      
Fair value of common stock issued     $ 322,000                      
Common Stock | At-The-Market Equity Distribution                            
Class of Stock [Line Items]                            
Maximum offering price                         $ 50,000,000  
Shares sold (in shares) | shares 7,400,000                          
Proceeds received $ 30,500,000                          
Stock Repurchase Program                            
Class of Stock [Line Items]                            
Common stock, par value (in dollars per share) | $ / shares                           $ 0.01
Share repurchase program authorized amount $ 50,000,000             $ 50,000,000   $ 50,000,000       $ 50,000,000
Shares of stock repurchased during period (in shares) | shares                   0 0      
Series D Preferred Stock                            
Class of Stock [Line Items]                            
Preferred stock dividend rate               8.25% 8.25% 8.25% 8.25% 8.25%    
Annual preferred stock dividend (in dollars per share) | $ / shares                   $ 2.0625