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Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 1,775  
2020 2,202  
2021 2,172  
2022 1,291  
2023 720  
Thereafter 208  
Intangible assets, net $ 8,368 $ 9,006