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Acquired Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization $ 488 $ 488 $ 488
Total 1,830    
2020 488    
2021 488    
2022 488    
2023 366    
2024 $ 366