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ORGANIZATION, BASIS OF PRESENTATION, AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 169,878 $ 131,329 $ 467,443 $ 80,428
Non-current restricted cash 1,500 1,500 1,500 1,500
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows $ 171,378 $ 132,829 $ 468,943 $ 81,928