Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Activity of Stock Options (Details)

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SHARE-BASED COMPENSATION - Activity of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2022
Jun. 30, 2021
Dec. 31, 2021
Stock Options      
Outstanding, beginning balance (in shares) 784,193    
Granted (in shares) 18,114    
Exercised (in shares) (123,300)    
Forfeited (in shares) (29,112)    
Expired (in shares) (48,672)    
Outstanding, ending balance (in shares) 601,223    
Vested and expected to vest (in shares) 589,942    
Vested and exercisable (in shares) 397,714    
Weighted-Average Exercise Price      
Outstanding, beginning (USD per share) $ 5.91    
Granted (USD per share) 2.76    
Exercised (USD per share) 0.24    
Forfeited (USD per share) 10.00    
Expired (USD per share) 7.64    
Outstanding, ending (USD per share) 6.56    
Vested and expected to vest (USD per share) 6.49    
Vested and exercisable (USD per share) $ 6.72    
Weighted-Average Remaining Contractual Term (Years) and Aggregate Intrinsic Value      
Outstanding term 2 years 10 months 28 days 3 years 8 months 4 days  
Granted term 9 years 9 months    
Vested and expected to vest term 2 years 11 months 1 day    
Vested and exercisable term 2 years 4 months 2 days    
Outstanding $ 0   $ 0
Exercised 97    
Vested and expected to vest 0    
Vested and exercisable $ 0