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Fair Value of Financial Assets and Liabilities (Details) - Recurring basis - Total - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Cash equivalents | $ 22,807 | $ 11,188
Total Assets | 22,807 | 11,188
Level 1 |  |
Assets: |  |
Cash equivalents | 22,807 | 11,188
Total Assets | 22,807 | 11,188
Level 2 |  |
Assets: |  |
Cash equivalents | 0 | 0
Total Assets | 0 | 0
Level 3 |  |
Assets: |  |
Cash equivalents | 0 | 0
Total Assets | $ 0 | $ 0

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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