Note 5 — Available-For-Sale Securities

Available-for-sale securities consist of the following interest-bearing investments:


	As of September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate bonds	$	48,252	$	—	$	721	$	47,531
Money market funds		30,883		—		—		30,883
U.S. government treasuries		23,656		—		398		23,258
U.S. agency securities		16,297		—		264		16,033
Asset backed obligations		9,312		—		135		9,177
Supranational and sovereign debt		4,508		—		74		4,434

Total(1)	$	132,908	$	—	$	1,592	$	131,316

(1)

Available-for-sale securities with maturities longer than 90 days from the date of acquisition were classified as short-term interest-bearing investments and available-for-sale securities with maturities of 90 days or less from the date of acquisition were included in cash and cash equivalents on the Company’s balance sheet. As of September 30, 2018, $100,433 of securities were classified as short-term interest-bearing investments and $30,883 of securities were classified as cash and cash equivalents.


	As of September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate bonds	$	98,367	$	176	$	158	$	98,385
U.S. government treasuries		84,558		—		195		84,363
U.S. agency securities		60,794		—		148		60,646
Money market funds		52,504		—		—		52,504
Asset backed obligations		47,108		—		34		47,074
Commercial paper and certificates of deposit		33,448		—		—		33,448
Supranational and sovereign debt		8,819		—		42		8,777

Total(1)	$	385,598	$	176	$	577	$	385,197

(1)

Available-for-sale securities with maturities longer than 90 days from the date of acquisition were classified as short-term interest-bearing investments and available-for-sale securities with maturities of 90 days or less from the date of acquisition were included in cash and cash equivalents on the Company’s balance sheet. As of September 30, 2017, $329,997 of securities were classified as short-term interest-bearing investments and $55,200 of securities were classified as cash and cash equivalents.

As of September 30, 2018, the unrealized losses attributable to the Company’s available-for-sale securities were primarily due to credit spreads and interest rate movements. The Company assessed whether such unrealized losses for the investments in its portfolio were other-than-temporary. Based on this assessment, the Company did not recognize any credit losses in fiscal years 2018, 2017 and 2016.

As of September 30, 2018, the Company’s available-for-sale securities had the following maturity dates:


	Market Value
Due within one year	$	63,069
1 to 2 years		44,615
2 to 3 years		20,255
3 to 4 years		2,382
Thereafter		995

	$	131,316