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STOCK INCENTIVE PLANS - Summary of Option, Unvested RSU Activity under 2014 Equity Incentive Plan and 2016 Inducement Equity Incentive Plan and Related Information (Details)
 6 Months Ended
Jun. 30, 2024
$ / shares
shares
Shares Available for Grant  
Shares available for grant beginning balance (in shares) 869,111
Additional options authorized (in shares) 6,748,645
Common stock awards for services (in shares) (11,748)
RSUs granted (in shares) (3,360,339)
Options granted (in shares) (854,898)
Repurchase of common stock under employee incentive plans (in shares) 391,535
RSUs forfeited (in shares) 247,195
Options forfeited (in shares) 21,809
Options expired (in shares) 85,247
Shares available for grant ending balance (in shares) 4,136,557
Stock Options Outstanding  
Stock options outstanding beginning balance (in shares) 3,055,208
Stock options granted (in shares) 854,898
Stock options exercised (in shares) (20,037)
Stock options forfeited (in shares) (21,809)
Stock options expired (in shares) (85,247)
Stock options outstanding ending balance (in shares) 3,783,013
Weighted- Average Exercise Price  
Weighted average exercise price beginning balance (in dollars per share) | $ / shares $ 25.21
Weighted average exercise price - options granted (in dollars per share) | $ / shares 9.29
Weighted average exercise price - options exercised (in dollars per share) | $ / shares 6.54
Weighted average exercise price - options forfeited (in dollars per share) | $ / shares 27.94
Weighted average exercise price - options expired (in dollars per share) | $ / shares 30.19
Weighted average exercise price ending balance (in dollars per share) | $ / shares $ 21.58
Number of RSU Shares  
RSUs granted (in shares) 3,360,339
RSUs forfeited (in shares) (247,195)
Restricted Stock Units  
Shares Available for Grant  
RSUs granted (in shares) (3,360,339)
RSUs forfeited (in shares) 247,195
Number of RSU Shares  
Number of RSU shares beginning balance (in shares) 5,006,775
RSUs granted (in shares) 3,360,339
RSUs vested (in shares) (1,456,490)
RSUs forfeited (in shares) (247,195)
Number of RSU shares ending balance (in shares) 6,663,429
Weighted- Average Grant Date Fair Value  
Weighted average grant date fair value beginning balance (in dollars per share) | $ / shares $ 19.02
Weighted average grant date fair value - RSUs granted (in dollars per share) | $ / shares 9.32
Weighted average grant date fair value - RSUs vested (in dollars per share) | $ / shares 18.14
Weighted average grant date fair value - RSUs forfeited (in dollars per share) | $ / shares 17.32
Weighted average grant date fair value ending balance (in dollars per share) | $ / shares $ 14.54