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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - Recurring Measurements - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	$ 69,480	$ 0
Level 1
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	69,480	0
Level 2
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	0	0
Level 3
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	$ 0	$ 0

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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.

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- References

No definition available.

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