Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.2
Stockholders' Equity (Capital Raises) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 04, 2022
Apr. 23, 2021
Oct. 23, 2020
Jul. 31, 2021
Mar. 31, 2021
Nov. 30, 2020
Mar. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
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                 573,280
Stock offering, price per share                 $ 25.00
Stock offering, gross proceeds       $ 4.6         $ 14.3
Sale of stock, net proceeds       4.2         12.6
Preferred Stock, dividend rate percentage         8.00%        
Stock offering other fees paid                 0.3
Placement agent fees       $ 0.5         $ 1.4
Maximum [Member] | Journey [Member] | 8% Cumulative Convertible Class A Preferred Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock offering, aggregate offering permitted by the agreement         $ 12.5        
Minimum [Member] | Journey [Member] | 8% Cumulative Convertible Class A Preferred Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock offering, aggregate offering permitted by the agreement         $ 30.0        
Runway Note [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Proceeds from issuance of notes $ 30.0                
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               3,500,000 0
Stock offering, price per share               $ 1.63  
Stock offering, gross proceeds               $ 5.7  
Amount available for future stock offerings               $ 11.7  
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               4,300,000 10,400,000
Stock offering, price per share               $ 2.07 $ 3.42
Stock offering, gross proceeds               $ 8.9 $ 35.6
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               107,632 259,990
Shares issued (in percent)               2.50%  
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             6,800,000   16,200,000
Stock offering, price per share               $ 0.87 $ 3.94
Stock offering, gross proceeds             $ 5.9   $ 63.8
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               178,583 452,965
Stock offering, price per share               $ 1.33 $ 3.50
Number of Shares issuable for At-the-Market offering               41,652  
Shares issued (in percent)               2.50%  
Shelf Registration Statement [Member] | Checkpoint [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Amount available for future stock offerings               $ 45.7  
Shelf Registration Statement [Member] | Mustang [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Amount available for future stock offerings               200.0  
Shelf Registration Statement [Member] | Maximum [Member] | Checkpoint [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock offering, aggregate offering permitted by the agreement           $ 100.0      
Shelf Registration Statement [Member] | Maximum [Member] | Mustang [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock offering, aggregate offering permitted by the agreement   $ 200.0              
Mustang 2020 S-3 [Member] | Mustang [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock offering, aggregate offering permitted by the agreement     $ 100.0            
Amount available for future stock offerings               $ 8.7