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Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Intellectual property      
Intellectual property $ 700   $ 700
Less: Accumulated amortization (487)   (428)
Total, net 213   $ 272
Amortization expense $ 59 $ 59