Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Liabilities Measurements on a Recurring Basis (Details)

v3.21.1
FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Liabilities Measurements on a Recurring Basis (Details) - Fair Value Measurements on Recurring Basis - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Liabilities    
Total $ 18,258 $ 0
RTI Warrants    
Liabilities    
Warrants, fair value 15,000 0
Private Warrants    
Liabilities    
Warrants, fair value 3,258 0
Level 1    
Liabilities    
Total 0 0
Level 1 | RTI Warrants    
Liabilities    
Warrants, fair value 0 0
Level 1 | Private Warrants    
Liabilities    
Warrants, fair value 0 0
Level 2    
Liabilities    
Total 0 0
Level 2 | RTI Warrants    
Liabilities    
Warrants, fair value 0 0
Level 2 | Private Warrants    
Liabilities    
Warrants, fair value 0 0
Level 3    
Liabilities    
Total 18,258 0
Level 3 | RTI Warrants    
Liabilities    
Warrants, fair value 15,000 0
Level 3 | Private Warrants    
Liabilities    
Warrants, fair value $ 3,258 $ 0