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Investments

12 Months Ended

Dec. 31, 2019

Investments, Fair Value Disclosure [Abstract]

Investments in marketable securities as of December 31, 2018 consisted of the following:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Available-for-sale—short-term:
U.S. Treasury, government and agency debt securities	$	7,526	$	—	$	(2	)	$	7,524

During the year ended December 31, 2019, $7.5 million of available-for-sale investments matured, on which the realized gains were de minimis and there were no unrealized holding gains (losses) reclassified out of accumulated other comprehensive loss into the consolidated statements of operations. The Company had no sales of available-for-sale investments in 2019.

During the year ended December 31, 2018, the Company sold $9.2 million of available-for-sale investments, on which the realized gains were de minimis and there were no unrealized holding gains (losses) reclassified out of accumulated other comprehensive loss into the consolidated statements of operations.