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Fair Value of Financial Instruments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Mar. 10, 2021
Dec. 02, 2020
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]            
Fair value assets level 1 to 2 transfers $ 0 $ 0 $ 0 $ 0    
Fair value assets level 2 to 1 transfers 0 0 0 0    
Fair value liabilities level 1 to 2 transfers 0 0 0 0    
Fair value liabilities level 2 to 1 transfers 0 0 0 0    
Fair value assets transfers in to level 3 0 0 0 0    
Fair value assets transfers out of level 3 0 0 0 0    
Fair value liability transfers in to level 3 0 0 0 0    
Fair value liability transfers out of level 3 $ 0 $ 0 0 $ 0    
Debt instrument, face amount           $ 2,990
Ally Financial            
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]            
Amount of floor plan credit facility         $ 30,000  
Convertible note            
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]            
Fair value of debt     $ 3,264