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Fair Value Measurements (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration	$ 122,426,000	$ 94,729,000
Fixed payments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred acquisition consideration	3,340,000	$ 1,520,000
Common Class A
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition related consideration settled through issuance of shares	3,353,939
Common Stock | Common Class A
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition related consideration settled through issuance of shares	$ 28,727

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Amount of liability recognized arising from contingent consideration in a business combination.

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