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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

Marketable Securities

Schedule of marketable securities

Marketable securities consist of the following:

		March 31, 2021
					Gross			Gross
		Amortized			Unrealized			Unrealized			Estimated
(in thousands)		Cost			Gain			Loss			Fair Value
Corporate bonds		$	231,530		$	337		$	(158)		$	231,709
Total		$	231,530		$	337		$	(158)		$	231,709

		December 31, 2020
					Gross			Gross
		Amortized			Unrealized			Unrealized			Estimated
(in thousands)		Cost			Gain			Loss			Fair Value
Corporate bonds		$	242,900		$	854		$	(75)		$	243,679
Commercial paper			6,997			—			—			6,997
Total		$	249,897		$	854		$	(75)		$	250,676

Schedule of available-for-sale maturities

		March 31, 2021
					Fair
(in thousands)		Cost			Value
Maturities:
Within 1 year		$	115,920		$	116,233
Between 1 to 2 years			115,610			115,476
Total investments available for sale		$	231,530		$	231,709

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Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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