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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]      
Allowance for obsolescence $ 37 $ 221 $ 24
Raw materials - current 18,619 18,026  
Work-in-process 1,363 1,900  
Inventory - current 19,982 19,926  
Raw materials - long term (net of allowances of $37 and $221, respectively) 1,105 1,065  
Inventory - total $ 21,087 $ 20,991