Short-term investments consisted of the following as of the dates presented (in thousands):

	March 31, 2021
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Corporate bonds	$	396,301	$	50	$	(150	)	$	396,201
U.S. treasury securities		84,193		22		—			84,215
Asset-backed securities		28,314		24		(6	)		28,332
Certificates of deposit		3,772		1		(1	)		3,772
Total	$	512,580	$	97	$	(157	)	$	512,520

	June 30, 2020
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Corporate bonds	$	70,781	$	360	$	(10	)	$	71,131
U.S. treasury securities		28,281		88		(1	)		28,368
Asset-backed securities		24,333		142		—			24,475
Total	$	123,395	$	590	$	(11	)	$	123,974

The amortized cost and fair value amounts include accrued interest receivable of $1.7 million and $0.5 million as of March 31, 2021 and June 30, 2020, respectively.

As of March 31, 2021, the fair value of the Company’s short-term investments that mature within one year and thereafter was $284.4 million and $228.1 million, respectively, or 55% and 45%, respectively, of the Company’s total short-term investments. As of June 30, 2020, the fair value of the Company’s short-term investments that mature within one year and thereafter was $102.9 million and $21.1 million, respectively, or 83% and 17%, respectively, of the Company’s total short-term investments.

The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of the dates presented (in thousands):

	March 31, 2021
	Fair value		Unrealized losses
Corporate bonds	$	259,691	$	(150	)
Asset backed securities		15,381		(6	)
Certificates of deposit		1,254		(1	)
Total	$	276,326	$	(157	)

	June 30, 2020
	Fair value		Unrealized losses
Corporate bonds	$	9,258	$	(10	)
U.S. treasury securities		2,798		(1	)
Total	$	12,056	$	(11	)

Investments with unrealized losses have been in a continuous unrealized loss position for less than 12 months. The Company does not intend to sell the investments and it is not likely that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity. Therefore, the Company does not consider those unrealized investment losses as other-than-temporary impairment of the investments. There have been no significant realized gains or losses on the short-term investments during the three and nine months ended March 31, 2021 and 2020.