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Fair Value Measurements - Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Liabilities: |  |  |
Warrants potentially settleable in cash | $ 1,013 | $ 1,309 |
Unobservable Inputs (Level 3) |  |  |
Liabilities: |  |  |
Contingent consideration | 4,326 | 1,294 | $ 0
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Cash equivalents | 5,195 | 1,662 |
Restricted cash equivalents |  | 10,245 |
Total assets measured and recorded at fair value | 5,195 | 11,907 |
Liabilities: |  |  |
Warrants potentially settleable in cash | 1,013 | 1,309 |
Contingent consideration | 4,326 | 1,294 |
Total liabilities measured and recorded at fair value | 5,339 | 2,603 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1) |  |  |
Assets: |  |  |
Cash equivalents | 5,195 | 1,662 |
Restricted cash equivalents |  | 10,245 |
Total assets measured and recorded at fair value | 5,195 | 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 | 1,013 | 1,309 |
Contingent consideration | 4,326 | 1,294 |
Total liabilities measured and recorded at fair value | $ 5,339 | $ 2,603 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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