Available-for-Sale Securities

3 Months Ended

Mar. 31, 2020

Available-for-Sale Securities

Available-for-Sale Securities

4. Available-for-Sale Securities

As of March 31, 2020, available-for-sale securities consisted of the following (in thousands):

			Gross		Gross		Aggregate
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
U.S. treasury securities	$	64,966	$	85	$	—	$	65,051

As of December 31, 2019, available-for-sale securities consisted of the following (in thousands):

			Gross		Gross		Aggregate
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
U.S. treasury securities	$	134,826	$	—	$	—	$	134,826

As of March 31, 2020, there were no available-for-sale securities that have been in a continuous unrealized loss position.

As of March 31, 2020, the amortized cost and fair value of available-for-sale securities by contractual maturity were (in thousands):

	Amortized		Fair
	Cost		Value
Due in one year or less	$	64,966	$	65,051
Due in one year to two years		—		—
Total	$	64,966	$	65,051