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Fair Value Measurements - Fair value measurement (Details) - Recurring - Money market funds - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Money market funds	$ 67,431	$ 70,760
Level 1
Assets:
Money market funds	67,431	70,760
Level 2
Assets:
Money market funds	0	0
Level 3
Assets:
Money market funds	$ 0	$ 0

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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.

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