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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS NON-CASH SUPPLEMENTAL DATA        
Accrued liabilities for intangible assets $ 14,000 $ 9,800 $ 12,800  
Accounts payable for purchase of available-for-sale short-term investment     $ 8,700 $ 0