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Fair Value Measurements - Schedule of Assets and Liabilities (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Assets:
Investments in securities	$ 0	$ 65,541,000	$ 71,230,000
Assets	5,156,000	68,251,000	72,117,000
Liabilities:
Liabilities	2,233,000	3,014,000	2,508,000
Public Warrants
Liabilities:
Warrant liabilities	277,000	454,000	1,555,000
Private Placement Warrants
Liabilities:
Warrant liabilities	476,000	780,000	953,000
Series A Penny Warrants
Liabilities:
Warrant liabilities	1,480,000	1,780,000
Level 1
Assets:
Investments in securities		849,000	849,000
Assets	5,156,000	3,559,000	1,736,000
Liabilities:
Liabilities	277,000	454,000	1,555,000
Level 1 | Public Warrants
Liabilities:
Warrant liabilities	277,000	454,000	1,555,000
Level 1 | Private Placement Warrants
Liabilities:
Warrant liabilities	0	0	0
Level 1 | Series A Penny Warrants
Liabilities:
Warrant liabilities	0	0
Level 2
Assets:
Investments in securities		64,692,000	70,381,000
Assets	0	64,692,000	70,381,000
Liabilities:
Liabilities	476,000	780,000	953,000
Level 2 | Public Warrants
Liabilities:
Warrant liabilities	0	0	0
Level 2 | Private Placement Warrants
Liabilities:
Warrant liabilities	476,000	780,000	953,000
Level 2 | Series A Penny Warrants
Liabilities:
Warrant liabilities	0	0
Level 3
Assets:
Investments in securities		0	0
Assets	0	0	0
Liabilities:
Liabilities	1,480,000	1,780,000	0
Level 3 | Public Warrants
Liabilities:
Warrant liabilities	0	0	0
Level 3 | Private Placement Warrants
Liabilities:
Warrant liabilities	0	0	0
Level 3 | Series A Penny Warrants
Liabilities:
Warrant liabilities	1,480,000	1,780,000
Money market mutual funds
Assets:
Money market mutual funds	5,156,000	2,710,000	887,000
Money market mutual funds | Level 1
Assets:
Money market mutual funds	5,156,000	2,710,000	887,000
Money market mutual funds | Level 2
Assets:
Money market mutual funds	0	0	0
Money market mutual funds | Level 3
Assets:
Money market mutual funds	$ 0	$ 0	$ 0

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Fair value portion of asset recognized for present right to economic benefit.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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