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GENERAL AND ADMINISTRATIVE EXPENSE - General and Administrative Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]    
Salaries and benefits $ 16,067 $ 11,041
Consulting and professional fees 4,076 2,391
Insurance 1,584 616
Computer 1,133 900
Travel 291 1,100
Office and other expenses 1,475 2,067
General and administrative expense $ 24,626 $ 18,115