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Stock-based Compensation, Fair Value Assumptions (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Feb. 28, 2021
Sep. 30, 2021
Fair Value Assumptions [Abstract]    
Expected volatility   90.40%
Risk-free interest rate   1.00%
Expected life (in years)   5 years 10 months 24 days
Expected dividend yield   0.00%
Fair value of common stock (in dollars per share)   $ 1.68
Accelerated compensation expense $ 173  
Stock Options [Member]    
Fair Value Assumptions [Abstract]    
Option exercised (in shares)   (1,557,628)
Weighted average exercise price (in dollars per share)   $ 1.12
Stock option exercise, stock issued (in shares)   329,076