Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENTS - Senior Secured Notes Narrative (Details)

v3.22.0.1
LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENTS - Senior Secured Notes Narrative (Details) - USD ($)
$ in Millions
Feb. 07, 2022
Feb. 12, 2021
Jan. 31, 2022
Dec. 31, 2021
Feb. 02, 2018
Senior Secured Notes          
Line of Credit Facility [Line Items]          
Percentage of prepayment Premium   0.90%      
Cripple Creek Project          
Line of Credit Facility [Line Items]          
Restricted cash account   $ 180.0      
Restricted cash reserved       $ 176.6  
Cripple Creek Project | Subsequent Event          
Line of Credit Facility [Line Items]          
Restricted cash reserved     $ 221.0    
Senior Secured Notes Due 2028 | Senior Secured Notes          
Line of Credit Facility [Line Items]          
Aggregate principal amount   $ 310.0      
Interest rate   8.25%      
Borrowed funds designated for constructing project   $ 180.0      
Proceeds from the offering   $ 8.0      
Senior Secured Notes Due 2028 | Senior Secured Notes | Subsequent Event          
Line of Credit Facility [Line Items]          
Additional principal amount of debt issued $ 100.0        
Issue price, percentage 102.00%        
Interest rate 8.25%        
Senior Secured Notes Due 2024 | Senior Secured Notes          
Line of Credit Facility [Line Items]          
Aggregate principal amount         $ 100.0