Investment Securities (Tables)

3 Months Ended

Mar. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

Our short investment securities consisted of the following (in thousands):

	As of March 31, 2020
	Amortized Cost		Unrealized Holding Gains (Losses)		Fair Value
Short-term corporate bonds	$	20,115	$	—	$	20,115
	As of December 31, 2019
	Amortized Cost		Unrealized Holding Gains (Losses)		Fair Value
Short-term corporate bonds	$	23,967	$	—	$	23,967