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INCOME TAXES - DEFERRED TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Significant components of deferred tax assets    
Net operating loss carryforwards $ 272,300 $ 254,500
Federal and state tax credits 64,700 56,700
Capitalized research and development 43,300 21,800
Stock-based compensation 11,200 10,800
Operating lease liabilities 1,100 1,300
Other 3,600 5,600
Total deferred tax assets 396,200 350,700
Less: valuation allowance (395,200) (349,600)
Net deferred tax assets 1,000 1,100
Operating leases, right-of-use assets (1,000) (1,100)
Total deferred tax liabilities (1,000) (1,100)
Valuation allowance    
Increase (decrease) in valuation allowance $ 45,600 $ 38,900