Investments	12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	NOTE 4 – 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 $69.8 million and $55.6 million as of December 31, 2018 and 2017, respectively. All other investments are classified as held-to-maturity and consist of highly liquid instruments including primarily corporate bonds and commercial paper. As of December 31, 2018 and 2017, the amortized cost of these investments equaled the net carrying value, which was $10.1 million and $30.1 million, respectively. All held-to-maturity securities as of December 31, 2018 mature in one year or less. See Note 8, Fair Value Measurements, for additional information.

Investments

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

NOTE 4 – 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 $69.8 million and $55.6 million as of December 31, 2018 and 2017, respectively.

All other investments are classified as held-to-maturity and consist of highly liquid instruments including primarily corporate bonds and commercial paper. As of December 31, 2018 and 2017, the amortized cost of these investments equaled the net carrying value, which was $10.1 million and $30.1 million, respectively. All held-to-maturity securities as of December 31, 2018 mature in one year or less. See Note 8, Fair Value Measurements, for additional information.