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 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Stock Options    
Outstanding, beginning balance (in shares) 896,888  
Granted (in shares) 51,434  
Exercised (in shares) 0  
Forfeited (in shares) 0  
Outstanding, ending balance (in shares) 948,322 896,888
Vested and expected to vest (in shares) 937,041  
Vested and exercisable (in shares) 494,776  
Weighted-Average Exercise Price    
Outstanding, beginning price (USD per share) $ 5.22  
Granted price (USD per share) 14.40  
Exercised price (USD per share) 0  
Forfeited price (USD per share) 0  
Outstanding, ending price (USD per share) 6.15 $ 5.22
Vested and expected to vest (USD per share) 6.10  
Vested and exercisable (USD per share) $ 6.17  
Weighted-Average Remaining Contractual Term (Years) and Aggregate Intrinsic Value    
Outstanding term 4 years 21 days 3 years 11 months 15 days
Granted term 9 years 11 months 1 day  
Vested and expected to vest term 4 years 25 days  
Vested and exercisable term 3 years 8 months 15 days  
Outstanding $ 3,922 $ 2,889
Exercised 0  
Vested and expected to vest 3,923  
Vested and exercisable $ 2,102