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ORGANIZATION, BASIS OF PRESENTATION, AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Organization And Summary Of Significant Accounting Policies [Line Items]    
Increase in revenues $ 26,280,000 $ 13,076,000
Decrease in net loss 45,939,000 42,974,000
Impairment of goodwill or indefinite-lived intangible assets 0  
Impairment of long-lived assets 0  
Letter of credit established as a deposit $ 1,500,000  
Change in collaboration agreement scope | Collaboration agreement | Pfizer SB-525    
Organization And Summary Of Significant Accounting Policies [Line Items]    
Increase in revenues   100,000
Decrease in net loss   $ (100,000)
Earnings per share, basic (in dollars per share) $ 0