Gain (Loss) On Change In Fair Value Of Related Party Debt

No definition available.

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Balance Type:	credit
Period Type:	duration

- Definition

Gain (Loss) On Debt Instruments, Instrument Specific Credit Risk

+ References

No definition available.

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Balance Type:	credit
Period Type:	duration

- Definition

Proceeds From Issuance Of Long-Term Debt, Crypto Currency

+ References

No definition available.

+ Details

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Namespace Prefix:	gemi_
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Period Type:	duration

- Definition

Proceeds From Issuance Of Long-Term Debt, Crypto Currency Used During Period

+ References

No definition available.

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Period Type:	duration

- Definition

Proceeds From Issuance Of Long-Term Debt, Monetary

+ References

No definition available.

+ Details

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Namespace Prefix:	gemi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Proceeds From Issuance Of Long-Term Debt, Monetary, Used During Period

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Proceeds From Related Party Debt And Related Party Debt Received In Crypto Asset

+ References

No definition available.

+ Details

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Namespace Prefix:	gemi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Repayments Of Related Party Debt And Related Party Debt Denominated In Crypto Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	gemi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value of crypto asset classified as current. Excludes crypto asset held for platform user.

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- Definition

Number of restricted and unrestricted crypto asset units held. Excludes crypto asset units held for platform user.

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- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Related Party Loans and Convertible Notes - Schedule of Term Loans (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 11, 2025 USD ($)	Sep. 30, 2025 USD ($) crypto_unit	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) crypto_unit	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) crypto_unit	May 16, 2025	Jan. 23, 2025 USD ($)	May 16, 2024 USD ($)
Debt Instrument [Line Items]
Unrealized loss		$ 24,989	$ 0	$ 119,309	$ 0
Conversion of convertible notes to common stock in connection with IPO				(804,297)	$ 0
Crypto assets held		$ 674,963		$ 674,963		$ 470,101
Bitcoin
Debt Instrument [Line Items]
Number of crypto assets held (in units) \| crypto_unit		5,302		5,302		4,414
Ether
Debt Instrument [Line Items]
Number of crypto assets held (in units) \| crypto_unit		11,134		11,134		5,301
Secured Debt
Debt Instrument [Line Items]
Aggregate Principal Amount		$ 475,000		$ 475,000
Fair value of Principal Outstanding						$ 230,704
Amounts Drawn/Borrowed				212,758
Principal outstanding		443,500		443,500
Unrealized loss				119,309
Change in fair value attributable to instrument-specific credit risk				(2,396)
Conversion of convertible notes to common stock in connection with IPO	$ (585,000)			(584,560)
Interest Expense				17,680
Interest Payable		0		0
Cash received for issuance of long term debt				26,900
Cash received for issuance of long term debt, utilized during the period				26,900
Crypto assets held		$ 182,500		$ 182,500
Secured Debt \| Bitcoin
Debt Instrument [Line Items]
Crypto assets received in issuance of long-term debt (in units) \| crypto_unit				4,841
Crypto assets received for issuance of long term debt, utilized during the period (in units) \| crypto_unit				3,241
Number of crypto assets held (in units) \| crypto_unit		1,600		1,600
Secured Debt \| Ether
Debt Instrument [Line Items]
Crypto assets received in issuance of long-term debt (in units) \| crypto_unit				9,000
Crypto assets received for issuance of long term debt, utilized during the period (in units) \| crypto_unit				9,000
Secured Debt \| Minimum
Debt Instrument [Line Items]
Stated interest rate		4.00%		4.00%
Secured Debt \| Maximum
Debt Instrument [Line Items]
Stated interest rate		16.00%		16.00%
Secured Debt \| Term Loan 2024
Debt Instrument [Line Items]
Aggregate Principal Amount									$ 275,000
Fair value of Principal Outstanding						230,704
Amounts Drawn/Borrowed				$ 44,296		230,704
Amount Repaid						0
Principal outstanding						230,704
Unrealized loss				76,424
Change in fair value attributable to instrument-specific credit risk				(2,594)
Conversion of convertible notes to common stock in connection with IPO				(369,146)
Interest Expense				13,811		6,505
Interest Payable		$ 0		$ 0		$ 6,505
Blended interest rate		6.90%		6.90%		6.80%
Cash received for issuance of long term debt						$ 11,800
Cash received for issuance of long term debt, utilized during the period						11,800
Crypto assets held						$ 149,400
Secured Debt \| Term Loan 2024 \| Bitcoin
Debt Instrument [Line Items]
Crypto assets received in issuance of long-term debt (in units) \| crypto_unit						2,834
Crypto assets received for issuance of long term debt, utilized during the period (in units) \| crypto_unit						1,234
Number of crypto assets held (in units) \| crypto_unit						1,600
Secured Debt \| Term Loan 2024 \| Ether
Debt Instrument [Line Items]
Crypto assets received in issuance of long-term debt (in units) \| crypto_unit						9,000
Crypto assets received for issuance of long term debt, utilized during the period (in units) \| crypto_unit						9,000
Secured Debt \| Term Loan 2024 \| Minimum
Debt Instrument [Line Items]
Stated interest rate						4.00%	4.00%
Secured Debt \| Term Loan 2024 \| Maximum
Debt Instrument [Line Items]
Stated interest rate						16.00%	16.00%
Secured Debt \| Term Loan 2025
Debt Instrument [Line Items]
Aggregate Principal Amount								$ 200,000
Fair value of Principal Outstanding						$ 0
Amounts Drawn/Borrowed				$ 168,462
Unrealized loss				42,885
Change in fair value attributable to instrument-specific credit risk				198
Conversion of convertible notes to common stock in connection with IPO				(215,414)
Interest Expense				3,869
Interest Payable		$ 0		$ 0
Blended interest rate		7.30%		7.30%
Secured Debt \| Term Loan 2025 \| Minimum
Debt Instrument [Line Items]
Stated interest rate								4.00%
Secured Debt \| Term Loan 2025 \| Maximum
Debt Instrument [Line Items]
Stated interest rate								16.00%