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Equity and Stock-Based Compensation (Narrative) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Jul. 12, 2021
USD ($)
May 25, 2021
USD ($)
May 11, 2021
USD ($)
shares
Apr. 21, 2021
shares
Feb. 04, 2021
USD ($)
day
shares
Mar. 31, 2021
USD ($)
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 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               $ 34,232,000   $ 6,410,000 $ 99,809,000 $ 6,410,000      
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                      
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               0     1,700,000        
Proceeds received               $ 0     $ 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     0     781,000        
Proceeds received               $ 0     $ 4,217,000        
Shares authorized (in shares) | shares         8,893,565                    
May 2021 Equity Distribution Agreement                              
Class of Stock [Line Items]                              
Shares sold (in shares) | shares               2,367,000     8,339,000        
Proceeds received               $ 13,287,000     $ 49,500,000        
May 2021 Equity Distribution Agreement | Virtu                              
Class of Stock [Line Items]                              
Maximum offering price     $ 50,000,000                        
Percentage of the gross sales price     0.01%                        
July 2021 Equity Distribution Agreements                              
Class of Stock [Line Items]                              
Shares sold (in shares) | shares               4,183,000     4,183,000        
Proceeds received               $ 21,149,000     $ 21,149,000        
July 2021 Equity Distribution Agreements | Virtu                              
Class of Stock [Line Items]                              
Maximum offering price   $ 100,000,000                          
Percentage of the gross sales price   1.00%                          
Common Stock                              
Class of Stock [Line Items]                              
Common shares issued (in shares) | shares               6,550,000   3,046,000 17,714,000 3,046,000      
Fair value of common stock issued               $ 66,000   $ 30,000 $ 178,000 $ 30,000      
Shares of stock repurchased during period (in shares) | shares                   1,000 50,000 36,000      
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