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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIIES - Reconciliation of Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 178,872 $ 131,329 $ 80,428  
Non-current restricted cash 1,500 1,500 1,500  
Cash, cash equivalents, and restricted cash as reported within the Consolidated Statements of Cash Flows $ 180,372 $ 132,829 $ 81,928 $ 143,918