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Goodwill and Intangible Assets, Net - Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Gross carrying amount $ 27,378 $ 27,240
Accumulated amortization 26,609 26,313
Intangible assets, net $ 769 $ 927