STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions				1 Months Ended									3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2023 day	Apr. 30, 2021 tranche	Feb. 08, 2018	Jun. 30, 2025 shares	Mar. 31, 2025 shares	Jan. 31, 2025	Dec. 31, 2022	Aug. 31, 2022 tranche shares	Jul. 31, 2022 tranche shares	Mar. 31, 2022 shares	Sep. 30, 2021 shares	Apr. 30, 2021 tranche shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	Jun. 30, 2025	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	May 20, 2025 shares	Dec. 31, 2024 shares	Nov. 06, 2024 shares	Dec. 31, 2023	Jul. 13, 2023 shares	Jul. 18, 2022 shares	Jan. 01, 2020 shares	Jan. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)																		15,722,908	7,826,923
Stock-based compensation, capitalized for software development | $													$ 1.2	$ 1.2
Lease obligation incurred | $																$ 3.1	$ 3.7
2022 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)																							1,500,000
Share-based payment arrangement, additional shares allowable under the plan (in shares)																				2,500,000		800,000			350,000
Share-based payment arrangement, number of shares available (in shares)													2,133,349			2,133,349
Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, percentage of grants in period								25.00%
Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, percentage of grants in period								25.00%
Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Vesting Percentage, Conditional						50.00%
Share-Based Payment Arrangement, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						6 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Vesting Percentage, Milestone Achieved						50.00%
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)																6,850,000
Compensation cost not yet recognized															1 year 2 months 12 days	10 months 24 days
Unvested PSU (in shares)													8,015,000			8,015,000			4,507,000
Restricted stock units | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)																6,850,468
Restricted stock units | Share-based Compensation Award, Tranche One | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period																4 years
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP, purchase price percentage			85.00%
ESPP | 2018 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)																			534,912,000
Share-based payment arrangement, number of shares available (in shares)													771,739			771,739
ESPP, number of shares authorized, annual increase (in shares)													500,000			500,000								500,000
Shares issued (in shares)																263,173
Number of shares authorized, annual increase																					1.00%
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				442,500	95,625			25,248	100,990	269,202	6,667	110,236
Consecutive trading days | day	20
Number of tranches | tranche		2						3	2			2
Share-based payment arrangement, vesting conditions achievement period		4 years
Performance-based RSUs | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period												12 months
Granted (in shares)												55,118
Number of tranches | tranche								2
Share-based payment arrangement, awards vested, percentage							25.00%
Performance-based RSUs | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period												12 months
Granted (in shares)												55,118
Number of tranches | tranche								2
Share-based payment arrangement, awards vested, percentage						25.00%
Performance-based RSUs | Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period												6 months
New Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)																		10,000,000