5. Marketable Securities

The Company invests in marketable securities that are classified as available-for-sale and recorded at fair value in the Company’s Consolidated Balance Sheets. Marketable securities reported as current assets represent investments that mature within one year from the balance sheet date. Long-term marketable securities represent investments with maturity dates greater than one year from the balance sheet date.

Unrealized gains and losses are excluded from earnings and reported as a separate component of accumulated other comprehensive income until the security is sold or matures. Gains or losses realized from sales of marketable securities are computed based on the specific identification method and recognized as a component of "Other expenses, net" in the accompanying Consolidated Statements of Operations. During fiscal year 2018, the Company sold marketable securities with a fair value and amortized cost of $1.6 million each and recognized nominal net losses. The Company collected cash proceeds of approximately $1.6 million from the sale of marketable securities and reclassified unrealized net holding losses of $0.1 million from accumulated other comprehensive income into "Other expenses, net" in the accompanying Consolidated Statements of Operations as a result of these transactions. During fiscal year 2017, the Company sold marketable securities with fair values and amortized cost of $3.6 million each and recognized net losses of less than $0.1 million. The Company collected cash proceeds of $3.5 million from the sale of marketable securities and reclassified unrealized net holding losses of approximately $0.1 million from accumulated other comprehensive income into "Other (expense) income, net" in the accompanying Consolidated Statements of Operations as a result of these transactions.

The following is a summary of the amortized cost and the fair value, including accrued interest receivable, as well as unrealized holding gains (losses) on the short-term and long-term marketable securities as of September 30, 2018 and 2017 (in thousands):


			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Losses		Gains		Fair Value
September 30, 2018:
U.S. Treasury securities and obligations of U.S. government agencies	$	30,142	$	(65)	$	—	$	30,077
Bank certificates of deposits		5,148		—		1		5,149
Corporate securities		14,763		(30)		—		14,733
Municipal securities		2,797		(17)		—		2,780
Other debt securities		779		—		—		779
	$	53,629	$	(112)	$	1	$	53,518
September 30, 2017:
Corporate securities	$	2,642	$	—	$	—	$	2,642
Other debt securities		28		—		—		28
	$	2,670	$	—	$	—	$	2,670

The fair values of the marketable securities by contractual maturities at September 30, 2018 are presented below (in thousands).


	Fair Value
Due in one year or less	$	46,281
Due after one year through five years		4,373
Due after five years through ten years		—
Due after ten years		2,864
Total marketable securities	$	53,518

Expected maturities could differ from contractual maturities because the security issuers may have the right to prepay obligations without prepayment penalties.

The Company reviews the marketable securities for impairment at each reporting period to determine if any of the securities have experienced an other-than-temporary decline in fair value. The Company considers factors, such as the length of time and extent to which the market value has been less than the cost, the financial condition and near-term prospects of the issuer, the Company’s intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of its amortized cost basis. If the Company believes that an other-than-temporary decline in fair value has occurred, it writes down the investment to fair value and recognizes the credit loss in earnings and the non-credit loss in accumulated other comprehensive income. There were no marketable securities in unrealized loss position as of September 30, 2017. As of September 30, 2018, aggregate fair value of the marketable securities in unrealized loss position was $43.0 million and was comprised primarily of U.S. Treasury securities, corporate securities, and municipal securities. Aggregate unrealized losses for these securities were insignificant as of September 30, 2018 and are presented in the table above. The securities in unrealized loss position as of September 30, 2018 were not considered other-than-temporarily impaired and, as such, the Company did not recognize impairment losses during the period then ended. The unrealized losses were attributable to changes in interest rates that impacted the value of the investments.