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Fair Value Measurement - Level 3 Liability (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($)
Accounts payable and accrued expenses |
Fair Value, Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Short-term portion of deferred payments | $ 400
Deferred payments [Member] |
Schedule of changes in fair value of level 3 liability |
Balance at beginning of year | 4,514
Amounts paid | (656)
Other adjustments to fair value | 698
Balance at end of year | $ 4,556

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