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INCOME TAX - Net loss before income taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net gain (loss) before income taxes:          
U.S. Domestic     $ (37,758) $ (8,013) $ (13,075)
Foreign     22,475 12,178 8,975
Income (loss) before taxes on income $ (1,771) $ (4,884) $ (15,283) $ 4,165 $ (4,100)