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Fair Value of Financial Instruments (Details) - Recurring basis - Level 1 - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of assets and liabilities measured at fair value |  |
Money market funds included in cash and cash equivalents | $ 122,701 | $ 104,700
Current portion of due from related parties related to share based payment awards | 3,669 | 4,910
Long term portion of due from related parties related to share based payment awards | 7,660 | 7,551
Current portion of employer compensation liability related to share based payment awards included in accounts payable and accrued expenses | 3,669 | 4,910
Long term portion of employer compensation liability related to share based payment awards | $ 7,660 | $ 7,551

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