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SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 288,576,000 $ 126,551,000    
Restricted cash included in prepaid expenses and other current assets 0 700,000    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 288,576,000 $ 127,251,000 $ 75,012,000 $ 64,481,000