Investment Securities (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

Our short and long-term investments in available-for-sale securities consisted of the following (in thousands):

	As of September 30, 2021
	Amortized Cost		Unrealized Holding Gains (Losses)		Fair Value
Short-term corporate bonds	$	18,009	$	—	$	18,009
Long-term corporate bonds	7,172		—		7,172
Total investment securities	$	25,181	$	—	$	25,181
	As of December 31, 2020
	Amortized Cost		Unrealized Holding Gains (Losses)		Fair Value
Short-term corporate bonds	$	14,687	$	—	$	14,687
Long-term corporate bonds	12,974		—		12,974
Total investment securities	$	27,661	$	—	$	27,661

Equity Method Investments [Table Text Block]

Our non-marketable equity method investments consisted of the following (in thousands):

	As of September 30, 2021		As of December 31, 2020
Equity method investments	$	3,250	$	—