Investments (Tables)

9 Months Ended

Sep. 30, 2020

Investments [Abstract]

Schedule of investments in available-for-sale securities at fair values

Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands):

	September 30, 2020
Description of the Securities	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Fair Value
Agency securities	$	39,993	$	2	$	—	$	—	$	39,995
Corporate securities	197,239		4		(12)		(147)		197,084
Government securities	132,475		1		(7)		—		132,469
Total	$	369,707	$	7	$	(19)	$	(147)	$	369,548

	December 31, 2019
Description of the Securities	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Agency securities	$	1,681	$	1	$	—	$	1,682
Corporate securities	49,027		6		(149)		48,884
Government securities	9,124		5		—		9,129
Total	$	59,832	$	12	$	(149)	$	59,695