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Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Deferred acquisition consideration |  | $ 122,426 | $ 83,707
Fixed payments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Deferred acquisition consideration |  | $ 3,340 | $ 1,343
Common Stock |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Stock issued during period (shares) |  | 3,353,939 |
Common Stock | Common Class A |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Deferred acquisition consideration settled through issuance of shares | $ 28,727 | $ 28,727 |

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