Investment Securities (Tables)

9 Months Ended

Sep. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

Our short and long-term investment securities consisted of the following (in thousands):

	As of September 30, 2019
	Amortized Cost		Unrealized Holding Gains (Losses)		Fair Value
Short-term corporate bonds	$	20,845	$	—	$	20,845
Long-term corporate bonds	—		—		—
Total investment securities	$	20,845	$	—	$	20,845
	As of December 31, 2018
	Amortized Cost		Unrealized Holding Gains (Losses)		Fair Value
Short-term corporate bonds	$	37,329	$	—	$	37,329
Long-term corporate bonds	2,025		—		2,025
Total investment securities	$	39,354	$	—	$	39,354