Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Activity for Warrant derivative Liability (Details)

v3.20.2
FAIR VALUE OF FINANCIAL INSTRUMENTS - Activity for Warrant derivative Liability (Details) - Recurring - USD ($)
$ in Thousands
3 Months Ended
May 31, 2020
Feb. 29, 2020
Nov. 30, 2019
May 31, 2019
Feb. 28, 2019
Nov. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning Balance     $ 5,444      
Ending Balance $ 2,009          
Level 3            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning Balance     5,444      
Ending Balance 2,009          
Level 3 | Derivative Warrant Liability            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning Balance 849 $ 2,240 5,444 $ 13,375 $ 14,646 $ 14,430
Adjustments to estimated fair value 1,160 (1,391) (3,204) (5,965) (1,271) 216
Ending Balance $ 2,009 $ 849 $ 2,240 $ 7,410 $ 13,375 $ 14,646