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Intangible Assets - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization $ 164,000 $ 169,000 $ 328,000 $ 338,000