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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities      
Net income $ 117,413 $ 99,225 $ 38,706
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 14,092 13,838 9,897
Stock-based compensation expense 15,590 11,570 6,985
Change in payment obligation related to acquisitions 19,251 (6,904) 350
Foreign currency translation (27) 20 (223)
Accrued interest, net (5,547) (3,646) (300)
Deferred taxes, net (654) (1,428) (2,755)
Accrued severance pay, net (274) (106) 663
Amortization of premium and accretion of discount on marketable securities (1,147) 0 0
Loss (gain) from sale of property and equipment (27) (12) 121
Net changes in operating assets and liabilities:      
Accounts receivable, net (5,329) (45,236) (34,239)
Prepaid expenses and other current assets (433) (434) (2,781)
Operating lease right-of-use assets 3,653 1,104 8,510
Operating lease liabilities (3,966) (1,909) (8,643)
Accounts payable 6,878 48,191 35,222
Accrued expenses and other liabilities (2,917) 9,320 21,446
Deferred revenue (1,093) (1,474) (1,853)
Net cash provided by operating activities 155,463 122,119 71,106
Cash flows from investing activities      
Purchases of property and equipment (811) (1,058) (627)
Proceeds from sale of property and equipment 27 12 95
Investment in marketable securities 111,026 0 0
Proceeds from sales and maturities of marketable securities 34,427 0 0
Proceeds from short-term deposits 253,400 217,200 12,700
Investment in short-term deposits (207,450) (253,400) (217,200)
Cash paid in connection with acquisitions, net of cash acquired (101,921) (9,570) (38,438)
Net cash used in investing activities (133,354) (46,816) (243,470)
Cash flows from financing activities      
Issuance of shares in private placement, net 0 0 230,489
Proceeds from exercise of stock-based compensation 2,433 5,833 6,898
Payments of contingent consideration (13,256) (9,091) 0
Repayment of long-term loans 0 0 (8,333)
Net cash provided by (used in) financing activities (10,823) (3,258) 229,054
Effect of exchange rate changes on cash and cash equivalents 141 (59) (33)
Net increase in cash and cash equivalents and restricted cash 11,427 71,986 56,657
Cash and cash equivalents and restricted cash at beginning of year 177,521 105,535 48,878
Cash and cash equivalents and restricted cash at end of year 188,948 177,521 105,535
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheet      
Cash and cash equivalents 187,609 176,226 104,446
Restricted cash 1,339 1,295 1,089
Total cash, cash equivalents, and restricted cash 188,948 177,521 105,535
Cash paid during the year for:      
Income taxes 18,030 7,689 4,365
Interest 6 5 203
Non-cash investing and financing activities:      
Creation of new lease right-of-use assets arising from lease liability 132 2,085 0
Purchase of property and equipment on credit $ 2 $ (47) $ 45