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Intangible Assets, net Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 22, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]            
Amortization expense   $ 2,180 $ 2,197   $ 6,199 $ 6,681
Impairment of intangible asset   $ 0 $ 0 $ 3,977 $ 0 $ 3,977
OpenNMS Assignment            
Finite-Lived Intangible Assets [Line Items]            
Finite lived intangible asset acquired in assignment $ 5,200          
Accumulated amortization of intangible asset $ (647)          
Minimum | OpenNMS Assignment            
Finite-Lived Intangible Assets [Line Items]            
Estimated lives of definite-lived intangible assets 4 years          
Maximum | OpenNMS Assignment            
Finite-Lived Intangible Assets [Line Items]            
Estimated lives of definite-lived intangible assets 6 years