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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net income (loss) $ 138,322 $ 33,137 $ (424,863)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 25,246 20,492 16,611
Amortization 5,869 5,954 6,246
Share based compensation expenses 240,721 224,625 236,836
Amortization of Debt Issuance Costs and Discounts 3,166 4,194 5,213
Changes in accrued interest and exchange rate on short-term and long-term deposits 852 (2,415) (86)
Non-cash impairment, restructuring and other costs 0 26,699 0
Amortization of premium and discount, accrued interest, and other gains (losses) on marketable debt securities, net (13,381) 8,346 6,252
Remeasurement loss (gain) on marketable equity securities and investments in privately held companies (2,536) (30,608) 200,338
Changes in deferred income taxes, net (5,196) (8,784) (57,865)
Changes in operating lease right-of-use assets 24,246 27,231 45,440
Changes in operating lease liabilities (33,086) (31,333) (45,051)
Foreign Currency Transaction Loss, before Tax 3,906 0 0
Decease (increase) in trade receivables 12,720 (15,308) (11,719)
Increase in prepaid expenses and other current and long-term assets (79,484) (20,105) (5,912)
Increase (decrease) in trade payables 11,967 (52,455) (18,514)
Increase (decrease) in employees and payroll accruals 86,550 (29,532) 2,862
Increase in short-term and long-term deferred revenues 74,450 76,193 55,387
Increase in accrued expenses and other current liabilities 3,083 11,915 25,977
Net cash provided by operating activities 497,415 248,246 37,152
Cash flows from investing activities:      
Proceeds from short-term and restricted deposits 276,697 625,495 644,809
Investment in short-term and restricted deposits (170,332) (297,917) (766,021)
Investment in trading marketable debt securities 267,209 0 0
Investment in available-for-sale marketable debt securities 0 (6,732) (202,611)
Proceeds from available-for-sale marketable debt securities 125,176 250,960 290,113
Purchase of property and equipment and lease prepayment (17,813) (63,021) (68,554)
Capitalization of internal use of software (1,523) (3,028) (2,110)
Proceeds from sale of marketable equity securities 22,148 68,671 51,596
Investments in privately held companies (3,160) (7,603) (1,300)
Proceeds from (investment in) other assets 550 (111) (580)
Net cash provided by (used in) investing activities (35,466) 566,714 (54,658)
Cash flows from financing activities:      
Repayment of convertible notes 0 (362,667) 0
Purchase of treasury shares (466,302) (127,017) (231,873)
Proceeds from exercise of options and ESPP shares 59,576 39,660 42,710
Net cash used in financing activities (406,726) (450,024) (189,163)
Effect of exchange rate changes on cash and cash equivalents (3,906) 0 0
Increase (decrease) in cash and cash equivalents 51,317 364,936 (206,669)
Cash and cash equivalents at the beginning of the year 609,622 244,686 451,355
Cash and cash equivalents at the end of the year 660,939 609,622 244,686
Supplemental disclosure of cash flow activities:      
Cash paid during the year for taxes 11,326 12,410 11,422
Interest received during the year 36,346 47,696 23,727
Supplemental information for non-cash transactions      
Right-of-use assets obtained in exchange for operating lease liabilities 3,545 255,690 142,496
Non-cash purchase of property and equipment $ 562 $ 3,750 $ 9,368