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Investments

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

NOTE 4

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INVESTMENTS

Cash and cash equivalents includes investments in money market funds that are valued based on the net asset value of the funds. The investments in these funds were $71.2 million and $69.8 million as of March 31, 2019 and December 31, 2018, respectively.

All other investments are classified as held-to-maturity and consist of highly liquid instruments, primarily including corporate bonds and commercial paper. As of March 31, 2019 and December 31, 2018, the amortized cost of these investments equaled the net carrying value, which was $10.0 million and $10.1 million, respectively. All held-to-maturity securities as of March 31, 2019 mature in one year or less. See Note 8, Fair Value Measurements, for additional information.