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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Warrants to purchase (in shares)     0 119,420
Impairment of right-of-use asset and related fixed assets $ 1,816 $ 0 $ 1,816 $ 0
Fair value of Placement Warrants at exercise       400
Change in fair value of warrants $ 2,055 $ (3,753) 4,885 $ (4,701)
Furniture and fixtures        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Impairment of right-of-use asset and related fixed assets     300  
Mountain View, California        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Impairment of right-of-use asset and related fixed assets     $ 1,500  
Two Thousand Sixteen And Two Thousand Seventeen Private Placement Warrants        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Warrants to purchase (in shares)     0