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Amortizable Intangible Assets (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Amortizable Intangible Assets Disclosure [Abstract]          
Amortization of intangible assets $ 1,422   $ 1,468 $ 4,289 $ 3,983
Remaining year ending December 31, 2019 5,600     5,600  
Year ending December 31, 2020 5,500     5,500  
Year ending December 31, 2021 5,500     5,500  
Year ending December 31, 2022 5,400     5,400  
Year ending December 31, 2023 5,300     5,300  
Year ending December 31, 2024 5,200     5,200  
Finite-Lived Intangible Assets [Line Items]          
Impairment charges $ 460   $ 0 $ 1,401 $ 0
In-process research and development [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment charges   $ 900      
Completed Technology [Member]          
Finite-Lived Intangible Assets [Line Items]          
Reclassification of intangible assets   $ 400