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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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