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Intangible Assets, Net - Future Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 2,500  
2020 2,500  
2021 417  
Net Balance $ 5,417 $ 7,917