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ACQUISITION - Identified assets acquired, and liabilities assumed and acquisition costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Jul. 08, 2020
Dec. 31, 2019
Dec. 31, 2018
Identified assets acquired, and liabilities assumed        
Goodwill $ 91,008   $ 85,349 $ 85,389
Neuralify acquisition        
Identified assets acquired, and liabilities assumed        
Accounts receivable   $ 226    
Contract assets   1    
Intangible assets   1,970    
Accounts payable   (79)    
Contract liabilities   (280)    
Net assets acquired   1,838    
Goodwill   $ 5,344    
Neuralify acquisition | Selling, general and administrative expenses        
Business Acquisition        
Acquisition related cost $ 100