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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES      
Accrued payroll and vacation $ 3,417 $ 3,697  
Accrued corporate and payroll related taxes 4,264 4,839  
Contingent consideration—current   1,703 $ 3,698
Current lease liability 3,013    
Other 5,760 7,520  
Accrued expenses and other current liabilities $ 16,454 $ 17,759