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Long-Term Debt and Other Financial Liabilities, Securities Purchase Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
May 09, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Apr. 26, 2021
Feb. 19, 2021
Jan. 08, 2021
May 07, 2020
May 04, 2020
Apr. 22, 2020
Apr. 14, 2020
May 13, 2019
Mar. 31, 2019
Securities Purchase Agreement [Abstract]                          
Number of Units issued in exchange for waiver of interest (in shares) 621,958                        
Number of Units issued to amend interest rate (in shares) 1,201,571                        
Fair value per unit (in dollars per share)   $ 0.70     $ 0.70 $ 1.70 $ 0.70 $ 1.92 $ 1.92 $ 1.92 $ 2.16 $ 3.40  
JDH Notes and JDH Loans [Member]                          
Securities Purchase Agreement [Abstract]                          
Accrued and unpaid interest   $ 4,350                     $ 2,115
Interest rate   5.50%                      
Deferred finance cost     $ 3,846                    
Fourth JDH Loan [Member]                          
Securities Purchase Agreement [Abstract]                          
Accrued and unpaid interest       $ 454                 $ 6
Interest rate     0.00% 6.00%                  
Deferred finance cost     $ 239                    
Fourth JDH Loan [Member] | Minimum [Member]                          
Securities Purchase Agreement [Abstract]                          
Percentage of net proceeds from public offerings used to prepay loan     25.00% 25.00%