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Goodwill and Intangible Assets - Goodwill and Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 14,991 $ 15,056
Accumulated Amortization 10,853 10,113
Net Carrying Value 4,138 4,943
Subscriber relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 7,855 7,860
Accumulated Amortization 5,771 5,231
Net Carrying Value 2,084 2,629
Distribution rights    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4,253 4,313
Accumulated Amortization 2,199 1,999
Net Carrying Value 2,054 2,314
Internally developed software    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 446 446
Accumulated Amortization 446 446
Net Carrying Value 0 0
Proprietary content    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 153 153
Accumulated Amortization 153 153
Net Carrying Value 0 0
Intellectual property    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,284 2,284
Accumulated Amortization 2,284 2,284
Net Carrying Value $ 0 $ 0