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Investments - Available-for-Sale

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Investments available-for-sale consisted of the following as of March 31, 2021 and December 31, 2020 (table in thousands):


	March 31, 2021
	Amortized Cost		Unrealized Gain		Unrealized Loss		Accrued Interest Income		Fair Value
Available-for-Sale Securities
Bonds	$	10,441	$	2	$	(1)	$	22	$	10,464


	December 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss		Accrued Interest		Fair Value
Available-for-Sale Securities
Bonds	$	9,987	$	3	$	—	$	7	$	9,997

The fair value of investments available-for-sale are determined using quoted market prices from daily exchange-traded markets based on the closing price as of the balance sheet date and are classified as a Level 1 measurement under ASC 820 Fair Value Measurements.

As of March 31, 2021 and December 31, 2020, the amortized cost and estimated fair value of our available-for-sale securities were due within one year.