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Long-Term Debt and Other Financial Liabilities, Second Jelco Loan (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
May 06, 2021
Feb. 28, 2021
Jun. 30, 2021
Jun. 30, 2020
Apr. 26, 2021
Feb. 19, 2021
Dec. 31, 2020
Subordinated Long-Term Debt [Abstract]              
Repayment of long-term debt     $ 66,722 $ 8,891      
Number of units issued (in shares) 4,285,714            
Number of securities called by each warrant (in shares)         1   1
Warrant exercise price (in dollars per share)         $ 0.70    
Share price (in dollars per share)         $ 0.70 $ 1.70  
Unamortized costs     1,702 349      
Repayment of subordinated long-term debt by issuance of shares     (3,000) $ 0      
Balance outstanding     207,917       $ 173,289
Deferred financing costs     4,088       $ 3,527
Pre-Funded Warrant [Member]              
Subordinated Long-Term Debt [Abstract]              
Number of securities included in each unit (in shares)         1    
Warrant exercise price (in dollars per share)             $ 0.0001
Warrant [Member]              
Subordinated Long-Term Debt [Abstract]              
Number of securities included in each unit (in shares)         1    
Common Stock [Member]              
Subordinated Long-Term Debt [Abstract]              
Number of securities included in each unit (in shares)         1    
Second Jelco Loan [Member]              
Subordinated Long-Term Debt [Abstract]              
Repayment of long-term debt   $ 100          
Unamortized costs $ 424            
Repayment of subordinated long-term debt by issuance of shares $ 3,000            
Balance outstanding     1,850        
Deferred financing costs     $ 161