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Fair Value Measurements - Common Stock Warrants (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
shares
Jun. 30, 2021
$ / bbl
shares
Dec. 31, 2020
shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants not settleable in cash, fair value | $ $ 3.9    
Common stock, shares issued (in shares)   60,184,679 54,002,538
Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, price per barrel | $ / bbl   14.45  
Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, price per barrel | $ / bbl   20.63  
Warrant      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Common stock warrants exercised (in shares) 354,350    
Common stock, shares issued (in shares) 350,542    
Common stock warrants outstanding (in shares)   0