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Fair Value of Financial Instruments (Details) - Recurring basis - Level 1 - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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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Fair value of current portion of trade and related party payables, accrued expenses and deposits related to share based payment awards.

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Fund that invests in short-term money-market instruments, for example, but not limited to, commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid securities which is included in cash and cash equivalents

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