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Fair Value Measurements (Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities: |  |
Warrants potentially settleable in cash | $ 975 | $ 1,309
Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Contingent consideration | 5,319 | 1,294
Fair Value, Measurements, Recurring |  |
Assets: |  |
Cash equivalents | 6,774 | 1,662
Restricted cash equivalents |  | 10,245
Total assets measured and recorded at fair value | 6,774 | 11,907
Liabilities: |  |
Warrants potentially settleable in cash | 975 | 1,309
Contingent consideration | 5,319 | 1,294
Total liabilities measured and recorded at fair value | 6,294 | 2,603
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1) |  |
Assets: |  |
Cash equivalents | 6,774 | 1,662
Restricted cash equivalents |  | 10,245
Total assets measured and recorded at fair value | 6,774 | 11,907
Liabilities: |  |
Warrants potentially settleable in cash | 0 | 0
Contingent consideration | 0 | 0
Total liabilities measured and recorded at fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents | 0 | 0
Restricted cash equivalents |  | 0
Total assets measured and recorded at fair value | 0 | 0
Liabilities: |  |
Warrants potentially settleable in cash | 0 | 0
Contingent consideration | 0 | 0
Total liabilities measured and recorded at fair value | 0 | 0
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents | 0 | 0
Restricted cash equivalents |  | 0
Total assets measured and recorded at fair value | 0 | 0
Liabilities: |  |
Warrants potentially settleable in cash | 975 | 1,309
Contingent consideration | 5,319 | 1,294
Total liabilities measured and recorded at fair value | $ 6,294 | $ 2,603

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