Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Impairment of intangible assets	$ 0
Accumulated amortization	5,378,000	$ 5,251,000
Amortization expense	$ 127,000	$ 683,000
Minimum
Business Acquisition [Line Items]
Intangible assets, estimated useful life	5 years
Maximum
Business Acquisition [Line Items]
Intangible assets, estimated useful life	12 years
Customer relationships
Business Acquisition [Line Items]
Intangible assets, estimated useful life	5 years
Accumulated amortization	$ 4,335,000
Affiliate network
Business Acquisition [Line Items]
Intangible assets, estimated useful life	12 years
Accumulated amortization	$ 597,000
Trademarks
Business Acquisition [Line Items]
Intangible assets, estimated useful life	8 years
Accumulated amortization	$ 444,000