General form of registration statement for all companies including face-amount certificate companies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warrant Liabilities (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warrant Liabilities (Details) - USD ($)
 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Dec. 07, 2020
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Dec. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]                  
Price per share   $ 5.40     $ 0.33 $ 5.40   $ 0.33  
Exercise Price per Warrant (in usd per share)                 $ 2.01
Net loss   $ (13,548,000)   $ (5,702,000)   $ (26,086,000) $ (10,484,000) $ (21,807,000) $ (25,678,000)
JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Price per share   $ 10.00       $ 10.00      
Warrants, conversion ratio   1       1      
Stock price trigger for redemption of public warrants (in dollars per share)           $ 18.00      
Interest Income   $ 5,210       $ 9,910      
Net loss   (2,660,294) $ 16,083,886   $ (1,767,451) 13,423,592      
Redeemable Class A Ordinary Shares | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Interest Income   5,210       9,910      
Net loss   $ 5,210     $ 0        
Redeemable Net Earnings           $ 9,910      
Basic and diluted weighted average shares outstanding   34,500,000     34,500,000 34,500,000      
Basic and diluted net income per ordinary shares   $ 0.00     $ 0.00 $ 0.00      
Non-Redeemable Class B Ordinary Shares | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Net loss   $ (2,660,294)     $ (1,767,451) $ 13,423,592      
Redeemable Net Earnings   $ (5,210)       $ (9,910)      
Basic and diluted weighted average shares outstanding   8,625,000     7,758,028 8,625,000      
Basic and diluted net income per ordinary shares   $ (0.30)     $ (0.23) $ 1.56      
Non-Redeemable Net Loss   $ (2,665,504)     $ 0 $ 13,413,682      
Redemption of Warrants When the Price per Share of Class A Common Stock Equals or Exceeds $18.00 | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Stock price trigger for redemption of public warrants (in dollars per share)         $ 18.00        
Initial Public Offering | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Sale of units (in shares) 34,500,000         34,500,000      
Price per share $ 10.00 $ 10.00       $ 10.00      
Number of shares in a unit 1         1      
Number of warrants in a unit 0.25         0.25      
Warrants, conversion ratio 1 1       1      
Exercise Price per Warrant (in usd per share) $ 11.50 $ 11.50       $ 11.50      
Over-allotment | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Sale of units (in shares) 4,500,000         4,500,000      
Public Warrants | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Number of warrants issued           8,625,000      
Warrants, conversion ratio   1       1      
Exercise Price per Warrant (in usd per share)   $ 11.50       $ 11.50      
Public Warrants | Redemption of Warrants When the Price per Share of Class A Common Stock Equals or Exceeds $18.00 | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Stock price trigger for redemption of public warrants (in dollars per share)           $ 18.00      
Public Warrants | Initial Public Offering | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Number of warrants issued 8,625,000                
Exercise Price per Warrant (in usd per share) $ 11.50                
Private Placement Warrants | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Number of warrants issued           4,450,000      
Price of warrants         2.00 $ 2.00      
Exercise Price per Warrant (in usd per share)   $ 11.50     $ 11.50 $ 11.50   $ 11.50  
Private Placement Warrants | Over-allotment | JAWS Spitfire Acquisition Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Sale of units (in shares) 4,450,000