Business Combinations - CrowdStar, Inc. (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 06, 2016	Nov. 02, 2016	Dec. 31, 2016	Dec. 05, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Date of Acquisition [Abstract]
Cash paid to acquire non-controlling interest in Crowdstar			$ 4,667
Intangible assets:
Goodwill			$ 116,832		$ 87,890	$ 87,964
Minimum
Liabilities assumed:
Intangible assets estimated useful life			1 year
Maximum
Liabilities assumed:
Intangible assets estimated useful life			9 years
CrowdStar
Business Acquisition, Date of Acquisition [Abstract]
Voting power percent acquried	100.00%	80.60%
Cash paid	$ 45,461	$ 40,794
Cash paid to acquire non-controlling interest in Crowdstar	4,667
Assets acquired:
Cash	4,492
Accounts receivable	3,905
Prepaid expenses	521
Other current assets	34
Fixed assets	315
Intangible assets:
Intangible assets	16,000
Goodwill	28,776
Total assets acquired	54,043
Liabilities assumed:
Accounts payable	(584)
Accrued Liabilities	(4,284)
Deferred Revenue	(1,500)
Note Payable - Current Portion	(1,279)
Long Term Liabilities	(935)
Total liabilities acquired	(8,582)
Net acquired assets	45,461
Business acquisition, transitional costs	802
CrowdStar | Minimum
Business Acquisition, Date of Acquisition [Abstract]
Voting power percent acquried				90.00%
Titles, content and technology | CrowdStar
Intangible assets:
Intangible assets	$ 16,000
Titles, content and technology | CrowdStar | Minimum
Liabilities assumed:
Intangible assets estimated useful life	3 years
Titles, content and technology | CrowdStar | Maximum
Liabilities assumed:
Intangible assets estimated useful life	5 years