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Intangible Assets, net - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Amortization expense for intangible assets $ 0.1 $ 0.1 $ 0.4 $ 0.4
License        
Weighted average amortization period     7 years