The Company maintains certain cash balances restricted as to withdrawal or use. Restricted cash consists of cash deposits received from future astronauts that are contractually restricted for operational use until the condition of carriage is signed or the deposits are refunded.

The amortized cost, unrealized gain (loss) and estimated fair value of the Company’s cash, cash equivalents and marketable securities are as follows:


	June 30, 2026
	Amortized Cost		Gross Unrealized Loss		Fair Value
	(In thousands)
Cash and cash equivalents:
Cash and restricted cash	$	12,865	$	—	$	12,865
Money market	205,547		—		205,547
Marketable securities:
U.S. treasuries	59,672		(8)		59,664
Corporate bonds	8,052		(2)		8,050
	$	286,136	$	(10)	$	286,126


	December 31, 2025
	Amortized Cost		Gross Unrealized Gain		Fair Value
	(In thousands)
Cash and cash equivalents:
Cash and restricted cash	$	7,687	$	—	$	7,687
Money market	168,028		—		168,028
Marketable securities:
U.S. treasuries	9,884		14		9,898
Corporate bonds	152,372		43		152,415
	$	337,971	$	57	$	338,028

Interest receivable of $0.5 million and $2.0 million is included in other current assets in the accompanying condensed consolidated balance sheets as of June 30, 2026 and December 31, 2025, respectively.

The Company recognizes amortization and accretion of purchase premiums and discounts on its marketable securities in interest income in the accompanying condensed consolidated statements of operations and comprehensive loss. The Company recognized $0.4 million and $1.8 million in accretion income for its marketable securities for the three months ended June 30, 2026 and 2025, respectively. The Company recognized $0.8 million and $4.0 million in accretion income for its marketable securities for the six months ended June 30, 2026 and 2025, respectively.