Investments in corporate debt and equity securities as of December 31, 2024 and 2023 consist of the following (in thousands):


	Year Ended December 31,
	2024		2023
Corporate debt securities	$	21	$	48
Equity securities	559		—
Total marketable investments	$	580	$	48

The amortized cost basis amounts, gross unrealized holding gains, gross unrealized holding losses and fair values of available-for-sale debt securities as of December 31, 2024 and 2023, are as follows (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2024	$	21	$	—	$	—	$	21
December 31, 2023	$	48	$	—	$	—	$	48

During the year ended December 31, 2024 the Company exercised its right to purchase AOTI, Inc ("AOTI") restricted stock. Upon exercise, the Company received 402,634 shares of AOTI restrictedstock with a fair value of $0.7 million, or $1.68 per share. The restricted stock can be converted into publicly traded common shares one year after the exercise date.

The following table presents gains and losses on equity securities as prescribed by ASC 321, Investments - Equity Securities during the year ended December 31, 2024 and 2023 (in thousands):


	December 31,
	2024		2023
Net (gain) loss on equity securities during the period	$	(180)	$	799
Add: Net gain (loss) on warrants exercised or cancelled during the period	445		$	(799)
Add: Net loss recognized on equity securities sold during the period	(180)		—
Unrealized loss on equity securities held at the end of the period	$	85	$	—