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ACQUISITION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2023
Dec. 31, 2022
Oct. 01, 2020
Business Acquisition [Line Items]            
Stock-based compensation $ 302   $ 144      
Salaries and related 10,590   8,217      
Revenue since acquisition date 1,316          
Earnings (loss) since acquisition date (334)          
Restricted common stock            
Business Acquisition [Line Items]            
Stock-based compensation 90   $ 0      
Coit Staffing, Inc.            
Business Acquisition [Line Items]            
Fair value of assets acquired and consideration transferred           $ 3,997
Promissory note           1,350
Contingent consideration payable, annual payment           450
Earn out payment 200          
Employee agreement   2 years        
Transaction costs           $ 436
Stock-based compensation 90          
Contingent consideration payable 91          
Salaries and related $ 381          
Coit Staffing, Inc. | Forecast            
Business Acquisition [Line Items]            
Earn out payment       $ 2,030 $ 1,500  
Coit Staffing, Inc. | Restricted common stock            
Business Acquisition [Line Items]            
Stock granted during period, amount, acquisitions   $ 500        
Share-based compensation arrangement award vesting period 30 months          
Stock granted during period, shares, acquisitions 52,226          
Coit Staffing, Inc. | Restricted common stock | First Anniversary            
Business Acquisition [Line Items]            
Share-based compensation arrangement award vesting period   10 months        
Coit Staffing, Inc. | Restricted common stock | Second Anniversary            
Business Acquisition [Line Items]            
Share-based compensation arrangement award vesting period   20 months        
Coit Staffing, Inc. | Restricted common stock | Third Anniversary            
Business Acquisition [Line Items]            
Share-based compensation arrangement award vesting period   30 months