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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognized From Contracts With Customers (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
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers $ 100,077 $ 78,504 $ 339,591 $ 300,533 $ 252,268
Revenue from other sources 529 3,455 6,001 17,217 7,867
Total revenues 100,606 81,959 345,592 317,750 260,135
Revenue recognized at a point in time          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 97,343 76,648 332,939 297,077 $ 252,268
Revenue recognized over time          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers $ 2,734 $ 1,856 $ 6,652 $ 3,456