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- Definition

Share-Based Payment Arrangement, Evergreen Provision, Percentage of Outstanding Shares

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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

Number of additional shares authorized for issuance under share-based payment arrangement.

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No definition available.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders.

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Stock-based Compensation - Narrative (FY) (Details) - USD ($)		1 Months Ended	3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Aug. 12, 2021	Feb. 28, 2022	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	May 08, 2023	Mar. 22, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vested exercised, aggregate intrinsic value										$ 200,000	$ 5,100,000
Issuance of common stock for consulting services						$ 112,000				112,000
Consulting expense			$ 1,707,000		$ 2,156,000			$ 4,885,000	$ 6,453,000	8,480,000	11,580,000
Share-Based Payment Arrangement, Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock for consulting services (in shares)				0				0
Issuance of common stock for consulting services									$ 100,000	$ 100,000
Expiration period									6 months	6 months
Consulting expense							$ (100,000)		$ 100,000
Share-Based Payment Arrangement, Nonemployee \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock for consulting services (in shares)									2,700	2,700
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, period of recognition								9 months 18 days		1 year 3 months 18 days
Unrecognized compensation cost			5,900,000	$ 14,100,000				$ 5,900,000		$ 14,100,000
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost for unvested options			100,000	300,000				$ 100,000		$ 300,000
Unrecognized compensation cost, period of recognition								4 months 24 days		1 year 1 month 6 days
Consulting expense			71,000		$ 81,000			$ 216,000	$ 269,000	$ 352,000	538,000
Outstanding Vested and Expected to Vest RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost			$ 36,900	$ 400,000				$ 36,900		$ 400,000
Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares that would have been settled (in shares)				0						0
Consulting expense										$ 0	$ (70,000)
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Evergreen provision, percentage of outstanding shares	3.00%
2021 Equity Incentive Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)	119,658
2021 Equity Incentive Plan \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares available for grant (in shares)			324,302	45,721				324,302		45,721
Evergreen Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares available for grant (in shares)								248,508		50,664
Legacy Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares available for grant (in shares)								4,502		7,473
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Evergreen provision, percentage of outstanding shares	0.50%
Number of additional shares available for grant (in shares)								41,418		8,444
Remaining shares available for grant (in shares)			83,354	41,936				83,354		41,936
Issuance of common stock upon purchase of ESPP (in shares)								0		3,230
Outstanding liability			$ 4,000	$ 13,600				$ 4,000		$ 13,600
2021 Employee Stock Purchase Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)	31,909
2022 Inducement Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares available for grant (in shares)			115,036	60,952				115,036		60,952
Vesting period		4 years
2022 Inducement Equity Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)		80,000										160,000	140,000