Investments

12 Months Ended

Dec. 31, 2019

Cash And Cash Equivalents [Abstract]

Investments

(5) Investments

Cash Equivalents

Cash equivalents consisted of the following as of December 31, 2019 and 2018 (in thousands):

	December 31, 2019				December 31, 2018
	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Institutional Money Market Funds	$	55,258	$	55,258	$	29,948	$	29,948

As a result of the short-term nature of our investments, there were minimal unrealized holding gains or losses as of December 31, 2019, 2018 and 2017.

All the investments listed above have been classified as cash equivalents on our consolidated balance sheet as of December 31, 2019 and 2018, respectively.