Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Capital Raises) (Narrative) (Details)

v3.21.1
Stockholders' Equity (Capital Raises) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Oct. 23, 2020
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock offering, aggregate fees paid     $ 0 $ 188  
Preferred Stock, liquidation preference per share     $ 25.00   $ 25.00
Journey [Member] | 8% Cumulative Convertible Class A Preferred Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock offering, number of shares issued     501,480    
Sale of Stock, Price Per Share     $ 25.00    
Stock offering, gross proceeds     $ 12,500    
Stock offering, aggregate fees paid     1,200    
Sale of stock, net proceeds     $ 11,200    
Preferred Stock, dividend rate percentage     8.00%    
At the Market Offering [Member] | MLV & Co. and FBR Capital Markets & Co [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock offering, number of shares issued     0 2,300,000  
Sale of Stock, Price Per Share       $ 2.59  
Stock offering, gross proceeds       $ 6,100  
Stock offering, aggregate fees paid       $ 200  
At the Market Offering [Member] | Checkpoint [Member] | Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock offering, number of shares issued     7,025,309    
Sale of Stock, Price Per Share     $ 3.50    
Stock offering, gross proceeds     $ 24,600    
Sale of stock, net proceeds     $ 23,900    
At the Market Offering [Member] | Checkpoint [Member] | Common Stock [Member] | Founders Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock offering, number of shares issued   175,625      
Sale of Stock, Price Per Share     $ 3.61    
At the Market Offering [Member] | Mustang [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of Shares issuable for At-the-Market offering     63,688    
At the Market Offering [Member] | Mustang [Member] | Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock offering, number of shares issued     11,600,000 1,200,000  
Sale of Stock, Price Per Share     $ 4.17 $ 3.93  
Stock offering, gross proceeds     $ 48,400 $ 5,000  
Stock offering, aggregate fees paid     900 100  
Sale of stock, net proceeds     $ 47,500 $ 4,900  
At the Market Offering [Member] | Mustang [Member] | Common Stock [Member] | Founders Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock offering, number of shares issued     325,221 31,220  
Sale of Stock, Price Per Share     $ 4.16 $ 4.00  
Shelf Registration Statement [Member] | Checkpoint [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount available for future stock offerings     $ 71,300    
Shelf Registration Statement [Member] | Mustang [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock offering, aggregate offering permitted by the agreement $ 100,000        
Amount available for future stock offerings     $ 37,800