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Interim Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (3,630) $ (1,185)
Adjustments required to reconcile net loss to net cash provided by operating activities:    
Depreciation 821 809
Amortization of intangible assets 646 653
Equity-based compensation 3,198 3,107
Realized loss, net on sale of available-for-sale marketable securities 0 2
Amortization of premiums on available-for-sale marketable securities 127 105
Unrealized foreign exchange (gain) loss 391 (74)
Changes in operating assets and liabilities:    
Trade receivables 6,583 3,375
Prepaid expenses and other assets (1,288) (1,595)
Operating lease right-of-use assets 698 458
Accrued interest on bank deposits 156 439
Deferred tax, net (1,005) (1,016)
Trade payables (74) 140
Deferred revenues 960 392
Accrued expenses and other payables (464) (526)
Accrued payroll and related benefits 8,854 1,640
Operating lease liability (711) (436)
Accrued severance pay, net (69) 129
Net cash provided by operating activities 15,193 6,417
Cash flows from investing activities:    
Acquisition of business 0 (204)
Purchase of property and equipment (1,057) (790)
Investment in bank deposits 0 (8,893)
Proceeds from bank deposits 12,989 10,893
Investment in available-for-sale marketable securities (6,752) (13,108)
Proceeds from maturity of available-for-sale marketable securities 9,063 5,426
Proceeds from sale of available-for-sale marketable securities 1,975 3,757
Net cash provided by (used in) investing activities 16,218 (2,919)
Cash flows from financing activities:    
Purchase of treasury stock 0 (4,780)
Proceeds from exercise of stock-based awards 1,577 1,416
Net cash provided by (used in) financing activities 1,577 (3,364)
Effect of exchange rate changes on cash and cash equivalents (469) (34)
Increase in cash and cash equivalents 32,519 100
Cash and cash equivalents at the beginning of the period 21,143 22,803
Cash and cash equivalents at the end of the period 53,662 22,903
Supplemental information of cash-flow activities:    
Income and withholding taxes 2,192 1,084
Non-cash transactions:    
Property and equipment purchases incurred but unpaid at period end $ 7 $ 84