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Intangible Assets, Net - Schedule of future amortization expense of intangible assets (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
2019 $ 1,130
2020 1,446
2021 1,446
2022 1,446
2023 1,446
Thereafter 10,726
Total $ 17,640