STOCK-BASED COMPENSATION - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) anniversary $ / shares shares	Mar. 31, 2023 $ / shares	Dec. 31, 2023 shares	Jan. 01, 2024 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	10,015,497		7,523,947
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares	$ 3.18	$ 4.52
Expected dividend yield	0.00%	0.00%
Option, cost not yet recognized, amount | $	$ 18.3
Weighted average period of recognition (in years)	2 years 8 months 12 days
Stock Options | Granted after December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in months)	48 months
Cliff period (in years)	1 year
Contractual term (in years)	10 years
Stock Options | Granted prior to December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition (in years)	2 years 7 months 6 days
Number of anniversaries for vesting | anniversary	3
Non option, cost not yet recognized, amount | $	$ 5.8
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock maximum	1.00%
Common stock, capital shares reserved for future issuance (in shares)				579,105
Number of shares authorized (in shares)	1,769,088
Shares of common stock outstanding maximum (in shares)	800,000
Shares issued in period (in shares)	0
Minimum | Stock Options | Granted after December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in months)	12 months
Minimum | Stock Options | Granted prior to December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in months)	3 months
Maximum | Stock Options | Granted after December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in months)	48 months
Maximum | Stock Options | Granted prior to December 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in months)	24 months
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	3,231,274
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum threshold common stock issuable on exercise of incentive stock options (in shares)	12,000,000
Common stock, capital shares reserved for future issuance (in shares)				2,895,523
2021 Equity Incentive Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock maximum			5.00%
Number of shares authorized (in shares)	14,668,721
Shares available for future grant (in shares)	2,882,485