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Fair Value Measurements - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis (Details) - Recurring [Member] - Money Market Funds [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Assets: |  |  |
Money market funds | [1] | $ 34,907 | $ 4,161
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Money market funds | [1] | $ 34,907 | $ 4,161
[1] | Included in cash and cash equivalents

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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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