The Company classifies its short-term investments as available-for-sale securities. Available-for-sale securities are carried at fair market value with net unrealized gains and losses reported as a component of accumulated other comprehensive loss in stockholders’ equity. For the fiscal year ended September 30, 2021, the Company realized losses of $4,000 from the sale of short-term investments. No gains or losses were realized during the fiscal year ended September 30, 2020 from the sale of short-term investments.

The Company’s short-term investments were composed of the following (in thousands):

	AS OF SEPTEMBER 30, 2021
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments:
Corporate bonds	$	9,511	$	—	$	(15	)	$	9,496
Total	$	9,511	$	—	$	(15	)	$	9,496

The Company’s short-term investments had contractual maturities of $9.0 million due within one year and $0.5 million due from October 2022 to March 2023.

On July 13, 2020, the Company received an interest in a senior secured bond issued from an international seismic marine customer. The Company’s interest in the bond, which had a face value of $13.0 million, was received in exchange for $13.0 million of unpaid invoices and late fees owed by the customer. The bond was secured by a third in line lien on the assets owned by the customer and had an 8% interest rate with bi-annual interest and possible principal payments based on available excess cash flows. Interest payments could be made either in cash or in-kind payments in the form of additional debt security. In-kind interest payments require an 8.8% interest rate. The bond’s scheduled maturity date was July 13, 2022.

Upon receipt of the senior secured bond, the Company performed a fair value assessment of the investment to determine the bond’s initial carrying amount. In accordance with ASC 825, “Fair Value Instruments”, the Company determined that the investment is a Level 3 financial instrument primarily due to its unknown marketability. Because of the distressed financial condition of the customer, the Company believed the fair value of the bond is nominal.

In January 2021, the Company transferred the security pursuant to a purchase agreement (the “Agreement”) entered into with a third party (the “Buyer”). Pursuant to the Agreement, the Company received non-refundable consideration of $0.3 million and was entitled to receive additional cash compensation of $2.4 million from the Buyer if certain terms and conditions between the Buyer and the Company’s customer were met by December 31, 2021. In the event these terms and conditions were not met, the Company had the option to reacquire the bond from the Buyer for one dollar US ($1.00). The Company recognized a gain on investment of $0.3 million during the three months ended March 31, 2021 in connection with the transfer of the bond.

During the third quarter of fiscal year 2021, the Company agreed to a reduction to the additional cash compensation required from the Buyer to obtain full rights to the bond from $2.4 million to $1.8 million. In June 2021, the Company received the $1.8 million from the Buyer and relinquished all rights to the bond. The Company recognized a $1.7 million gain on the sale of the bond during the third quarter of fiscal year 2021.