INVESTMENT SECURITIES (Tables)

3 Months Ended

Mar. 31, 2021

INVESTMENT SECURITIES

Schedule of held-to-maturity securities

The following table summarize our investment securities at March 31, 2021 and December 31, 2020:

	March 31, 2021
	Amortized		Gross		Gross
	cost, as		unrealized		unrealized		Estimated
(in thousands)	adjusted		holding gains		holding losses		fair value
Short-term investments:
Obligations of domestic governmental agencies (maturing between April 2021 and March 2022) (held-to-maturity)	$	52,334	$	10	$	1	$	52,343
Total short-term investment securities	$	52,334	$	10	$	1	$	52,343
	December 31, 2020
	Amortized		Gross		Gross
	cost, as		unrealized		unrealized		Estimated fair
	adjusted		holding gains		holding losses		value
Short-term investments:
Obligations of domestic governmental agencies (maturing between January 2021 and December 2021) (held-to-maturity)	$	51,987	$	1	$	4	$	51,984
Total short-term investment securities	$	51,987	$	1	$	4	$	51,984