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ACQUISITION - Acquisition costs and identified assets acquired, and liabilities assumed and (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Jul. 08, 2020
Identified assets acquired, and liabilities assumed      
Goodwill $ 91,008 $ 90,813  
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      
Identified assets acquired, and liabilities assumed      
Acquisition related cost $ 100