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Intangible Assets - Schedule of Estimated Annual Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 (remaining six months) $ (328)  
2020 (628)  
2021 (598)  
2022 (563)  
2023 (563)  
Thereafter (1,444)  
Total $ (4,124) $ (4,452)