STOCKHOLDERS' EQUITY - Narrative (Details)			1 Months Ended				3 Months Ended				9 Months Ended
	Jan. 01, 2025 shares	Jan. 01, 2022	Sep. 30, 2025 USD ($) shares	Mar. 31, 2025 shares	Mar. 31, 2024 shares	May 31, 2021 USD ($) shares	Sep. 30, 2025 USD ($) shares	Jun. 30, 2025 USD ($) shares	Mar. 31, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2025 USD ($) purchase_period $ / shares shares	Sep. 30, 2024 USD ($) shares	Dec. 31, 2024 USD ($) shares	Oct. 31, 2024 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options issued (in shares)			2,590,802				2,590,802				2,590,802		3,152,158
Shares granted (in shares)							0			0	0	0
Total unrecognized stock-based compensation expense (less than) | $			$ 0				$ 0				$ 0
Accrued salary, payroll tax, and employee benefit liabilities | $			39,266,000				39,266,000				39,266,000		$ 25,210,000
Stock-based compensation expense | $							56,150,000			$ 48,175,000	$ 160,006,000	$ 137,532,000
Share repurchase program, authorized amount | $														$ 300,000,000
Stock repurchased and retired during period (in shares)											1,903,527
Shares acquired, average cost per share (in dollars per share) | $ / shares											$ 67.67
Stock repurchased and retired during period, value | $							25,655,000	$ 2,721,000	$ 100,440,000		$ 128,800,000
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized stock-based compensation expense | $			$ 1,500,000				$ 1,500,000				$ 1,500,000
Total unrecognized compensation cost, weighted-average period											2 months 12 days
Estimated dividend yield											0.00%
Offering period (in months)											12 months
Number of purchase periods | purchase_period											2
Duration of purchase periods (in months)						6 months					6 months
Percentage of eligible compensation						15.00%
Maximum amount each participant can contribute to a defined contribution plan per calendar year | $						$ 25,000
Maximum number of shares each participant can purchase during purchase period (in shares)						2,500
Purchase price, threshold, percentage of fair market value						85.00%
Expected dividend yield utilized			0				0				0
Accrued salary, payroll tax, and employee benefit liabilities | $			$ 10,500,000				$ 10,500,000				$ 10,500,000		$ 5,400,000
Stock-based compensation expense | $											$ 6,600,000	$ 6,600,000
Common stock, purchased (in shares)											245,276	276,349
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized stock-based compensation expense | $			468,500,000				468,500,000				$ 468,500,000
Total unrecognized compensation cost, weighted-average period											2 years 8 months 12 days
Shares granted (in shares)											3,762,491
Restricted Stock Units | IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs vesting period (in years)											4 years
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs vesting period (in years)				3 years	3 years
Total unrecognized stock-based compensation expense | $			$ 53,200,000				53,200,000				$ 53,200,000
Total unrecognized compensation cost, weighted-average period											2 years 9 months 18 days
Shares granted (in shares)			409,283	93,438	46,986						545,075
Award payout range, percentage											1
Share-based compensation arrangement by share-based payment award, equity instruments other than options, fair value | $			$ 47,500,000				$ 47,500,000				$ 47,500,000
Estimated dividend yield			0.00%
Performance Shares | Eligible Tranche 1 PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs vesting period (in years)			3 years
Performance Shares | Eligible Tranche 1 PSUs | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of awards			0.00%
Performance Shares | Eligible Tranche 1 PSUs | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of awards			50.00%
Performance Shares | Eligible Tranche 2 PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs vesting period (in years)			4 years
Percentage of awards, cap			1
Performance Shares | Eligible Tranche 2 PSUs | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of awards			0.00%
Performance Shares | Eligible Tranche 2 PSUs | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of awards			200.00%
Performance Shares | Revenue Performance Goals
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted (in shares)				70,078	35,239
Percentage of awards				75.00%	75.00%
Performance Shares | Revenue Performance Goals | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award payout range, percentage				0	0
Performance Shares | Revenue Performance Goals | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award payout range, percentage				2	2
Performance Shares | Non-GAAP Operating Margin Performance
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted (in shares)				23,360	11,747
Percentage of awards				25.00%	25.00%
Performance Shares | Non-GAAP Operating Margin Performance | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award payout range, percentage				0	0
Performance Shares | Non-GAAP Operating Margin Performance | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award payout range, percentage				1.50	1.50
Performance Shares | February 20, 2026
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award payout range, percentage				0.33
Performance Shares | Final Vesting, After February 20, 2026
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs vesting period (in years)				2 years
Performance Shares | Final Vesting, After February 20, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs vesting period (in years)					2 years
Performance Shares | On Or After February 20, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award payout range, percentage					0.33
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchased and retired during period (in shares)							404,433	48,503	1,450,591
Common Stock | Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares outstanding as a percent						1.00%
Maximum number of additional shares of common stock that may be issued (in shares)						3,900,000
Maximum amount common stock that may be issued (in shares)	1,498,531												6,780,128
Period of common stock reserved for issuance (in years)						10 years
2021 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options issued (in shares)			0				0				0
2021 Equity Incentive Plan | Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for issuance (in shares)			38,217,314				38,217,314				38,217,314		51,863,260
Shares outstanding as a percent		5.00%
Maximum number of additional shares of common stock that may be issued (in shares)	7,492,656
Maximum amount common stock that may be issued (in shares)			59,355,916				59,355,916				59,355,916