Intangible Assets - Narrative (Details) - USD ($) |
12 Months Ended | |
---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Business Acquisition [Line Items] | ||
Impairment of intangible assets | $ 0 | |
Accumulated amortization | 5,251,000 | $ 4,568,000 |
Amortization expense | $ 683,000 | $ 869,000 |
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 | $ 528,000 | |
Trademarks | ||
Business Acquisition [Line Items] | ||
Intangible assets, estimated useful life | 8 years | |
Accumulated amortization | $ 388,000 |