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Intangible assets, net (Schedule of estimated future amortization of intangible assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible assets, net      
Remainder of 2020 $ 2,136 $ 2,829  
2021 2,061 2,021  
2022 1,351 1,311  
2023 741 723  
2024 and thereafter 305 304  
Total $ 6,594 $ 7,188 $ 4,065