Description of Business and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) customer	Dec. 31, 2015 USD ($) customer	Dec. 31, 2014 USD ($) customer
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance		$ 1,184	$ 1,184	$ 1,275	$ 1,165
Additions Charged to Costs and Expenses			1,831	2,361	1,337
Deductions / Write-Offs			(1,283)	(2,452)	(1,227)
Ending Balance	$ 1,732		1,732	1,184	1,275
Property and equipment, useful life	4 years	3 years
Depreciation			12,011	12,114	9,071
Capitalized computer software	$ 3,700		$ 3,700	2,400	2,500
Typical service agreements			12 months
Advertising costs			$ 10,900	$ 10,700	$ 9,700
Requisite service period			4 years
Restructuring Charges [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Impairment of long-lived assets			$ 200
Selling, General and Administrative Expenses [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Impairment of long-lived assets			$ 2,600
Software and Software Development Costs [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Useful life of intangible asset			3 years
Minimum [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property and equipment, useful life			3 years
Termination notice period			30 days
Maximum [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property and equipment, useful life			5 years
Termination notice period			90 days
Customer Concentration Risk [Member] | Revenues [Member]
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, number of customers exceeding 10% | customer			0	0	0
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, number of customers exceeding 10% | customer			0		1