DEBT OBLIGATIONS - Narrative (Details)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 18, 2025 USD ($)	Dec. 31, 2025 USD ($) instrument $ / shares shares	Jun. 30, 2026 USD ($) shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2026 USD ($) shares	Jun. 30, 2025 USD ($) shares	Dec. 31, 2025 USD ($) instrument $ / shares shares	Dec. 31, 2024 shares	Aug. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares
Debt Instrument [Line Items]
Class of warrant or right, exercised (in shares) | shares					10,711,902	1,658,785
Interest expense, debt			$ 32,000	$ 4,887,000	$ 66,000	$ 9,301,000
Amortization of debt discount and issue cost			$ 2,000	$ 1,189,000	$ 5,000	$ 2,201,000
Warrants outstanding (in shares) | shares		14,215,311	3,493,409	18,980,778	3,493,409	18,980,778	14,215,311	14,615,703
2029 Senior Secured Term Loan Warrants | Secondary Offering
Debt Instrument [Line Items]
Class of warrant or right, exercised (in shares) | shares		3,690,079
Sale of stock, number of shares issued in transaction (in shares) | shares		3,065,826
Secured Debt | 2029 Senior Secured Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount				$ 40,000,000		$ 40,000,000			$ 100,000,000
Debt instrument, interest rate, stated percentage									12.90%
Repayments of long-term debt	$ 178,400,000
Loss on debt extinguishment							$ 107,700,000
Interest expense, debt				4,600,000		8,800,000
Amortization of debt discount and issue cost				1,200,000		2,100,000
Secured Debt | 2029 Senior Secured Term Loan | 2029 Senior Secured Term Loan Warrants - Group 1
Debt Instrument [Line Items]
Number of securities called by warrants (in shares) | shares									2,277,338
Exercise price of warrants (in dollars per share) | $ / shares									$ 7.15
Secured Debt | 2029 Senior Secured Term Loan | 2029 Senior Secured Term Loan Warrants - Group 2
Debt Instrument [Line Items]
Number of securities called by warrants (in shares) | shares									1,518,226
Exercise price of warrants (in dollars per share) | $ / shares									$ 8.55
Convertible Debt | Convertible Loan
Debt Instrument [Line Items]
Debt instrument, face amount											$ 5,000,000.0
Debt instrument, interest rate, stated percentage											9.50%
Interest expense, debt				$ 200,000		400,000
Long-term debt, term											5 years
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares		$ 16.00					$ 16.00				$ 16.00
Debt conversion, converted instrument, amount		$ 5,000,000.0
Debt conversion, converted instrument, shares issued (in shares) | shares		312,500
Interest payable		$ 100,000					$ 100,000
Debt conversion, interest, converted instrument, shares issued (in shares) | shares		5,287
Notes payable
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			8.00%		8.00%
Notes payable | Promissory Note
Debt Instrument [Line Items]
Debt instrument, face amount										$ 1,500,000
Debt instrument, interest rate, stated percentage										8.00%
Long-term debt, term										3 years
Share price (in dollars per share) | $ / shares										$ 20.50
Notes payable | Promissory Note | Promissory Note Warrants
Debt Instrument [Line Items]
Exercise price of warrants (in dollars per share) | $ / shares										$ 20.50
Warrants outstanding (in shares) | shares										7,408
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Interest expense, debt					$ 0	0
Long-term line of credit		$ 0	$ 0		0		$ 0
Line of Credit | Unsecured Revolving Lines Of Credit - MIAX Futures | Revolving Credit Facility
Debt Instrument [Line Items]
Number of debt instruments held | instrument		2					2
Line of Credit | Unsecured Revolving Lines Of Credit - MIAX Futures, Instrument One | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 6,000,000.0					$ 6,000,000.0
Line of Credit | Unsecured Revolving Lines Of Credit - MIAX Futures, Instrument Two | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 4,000,000.0					$ 4,000,000.0
Line of Credit | Secured Line Of Credit - MIAX Futures | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 40,000,000		$ 40,000,000
Debt instrument, interest rate, effective percentage		6.75%	6.75%		6.75%		6.75%
Commitment fee percentage					0.25%
Line of Credit | Unsecured Revolving Line Of Credit - Dorman Trading | Revolving Credit Facility
Debt Instrument [Line Items]
Interest expense, debt					$ 0	$ 0
Line of credit facility, maximum borrowing capacity			$ 10,000,000.0		10,000,000.0
Long-term line of credit		$ 0	$ 0		$ 0		$ 0
Debt instrument, basis spread on variable rate					3.00%