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STOCKHOLDERS' EQUITY - Summary of Warrant activity (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Class of Warrant or Right [Line Items]    
Vested and Exercisable 192,419  
Vested and Exercisable per share $ 5.84  
Warrant [Member]    
Class of Warrant or Right [Line Items]    
Options Outstanding at the end 192,419 235,095
Options Outstanding at the beginning (in dollars per share) $ 5.84 $ 5.89
Granted
Granted (in dollars per share)
Exercised (42,676)
Exercised (in dollars per share)  
Exercised 42,676
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 5.84 $ 5.84