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Intangible Assets - Estimated Future Amortization Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
2020   $ 325  
2021   296  
2022   296  
2023   296  
Thereafter   100  
Total $ 1,210 $ 1,313 $ 1,958