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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income (loss) $ 396 $ (2,379) $ 28
Adjustments required to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 3,184 3,233 3,104
Amortization of intangible assets 3,801 2,588 2,165
Equity-based compensation 13,055 13,636 10,718
Realized loss (gain), net on sale of available-for-sale marketable securities (13) 6 28
Amortization of premiums on available-for-sale marketable securities 420 444 554
Unrealized foreign exchange (gain) loss, net 1,163 (591) 249
Remeasurement of marketable equity securities (1,983) (0) (0)
Changes in operating assets and liabilities:      
Trade receivables, net 5,842 (2,917) (2,151)
Prepaid expenses and other assets 3,604 (559) (4,170)
Operating lease right-of-use assets 225 2,014 (1,281)
Accrued interest on bank deposits (65) 1,186 (161)
Deferred taxes, net (6,305) (335) (3,594)
Trade payables 404 186 53
Deferred revenues 5,053 (1,208) 85
Accrued expenses and other payables (1,737) 133 (131)
Accrued payroll and related benefits (875) 1,803 3,056
Operating lease liability (232) (2,183) 1,166
Income taxes payable 189 143 (53)
Accrued severance pay, net (322) (37) 9
Net cash provided by operating activities 25,804 15,163 9,674
Cash flows from investing activities:      
Acquisition of a business, net of cash acquired (see note 1) (29,891) 0 (11,000)
Purchase of property and equipment (2,193) (2,935) (3,461)
Purchase of intangible assets 0 0 (7,364)
Investment in bank deposits (1,500) (43,893) (39,346)
Proceeds from bank deposits 19,989 55,393 45,435
Investment in available-for-sale marketable securities (39,192) (56,011) (27,184)
Proceeds from maturity of available-for-sale marketable securities 26,043 21,956 3,888
Proceeds from sale of available-for-sale marketable securities 10,035 10,272 36,589
Net cash used in investing activities (16,709) (15,218) (2,443)
Cash flows from financing activities:      
Purchase of treasury stock 0 (4,780) (9,113)
Payment of contingent consideration liability 0 (204) 0
Proceeds from exercise of stock-based awards 3,242 2,871 2,437
Net cash provided by (used in) financing activities 3,242 (2,113) (6,676)
Effect of exchange rate changes on cash and cash equivalents (327) 508 (12)
Increase (decrease) in cash and cash equivalents 12,010 (1,660) 543
Cash and cash equivalents at the beginning of the year 21,143 22,803 22,260
Cash and cash equivalents at the end of the year 33,153 21,143 22,803
Supplemental information of cash-flows activities:      
Income and withholding taxes 9,183 4,727 5,063
Non-cash transactions:      
Property and equipment purchases incurred but unpaid at the end of the year 59 5 21
Right-of-use assets obtained in the exchange for operating lease liabilities $ 2,679 $ 6,787 $ 2,493