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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:      
Total revenues $ 135,922 $ 110,100 $ 95,837
Cost of revenues:      
Total cost of revenues 40,082 33,834 29,349
Gross profit 95,840 76,266 66,488
Operating expenses:      
Research and development (net of grant participations of $ 339, $ 378 and $ 374 for the years ended December 31, 2020, 2019 and 2018, respectively) 43,447 31,461 25,418
Sales and marketing 47,528 47,105 40,849
General and administrative 13,894 6,678 10,416
Total operating expenses 104,869 85,244 76,683
Operating loss (9,029) (8,978) (10,195)
Financial income, net 1,857 1,960 2,208
Loss before income tax expense (7,172) (7,018) (7,987)
Income tax expense 2,176 1,641 2,428
Net loss (9,348) (8,659) (10,415)
Unrealized gain (loss) on available-for-sale marketable securities 191 666 (216)
Net amount reclassified to earnings from available-for-sale marketable securities (40) 4 (10)
Total comprehensive gain (loss) from available-for-sale marketable securities 151 670 (226)
Unrealized gain (loss) on foreign currency cash flow hedges transactions 723 (332) (1,480)
Net amount reclassified to earnings from hedging transactions (203) (96) 903
Total comprehensive gain (loss) from hedge transactions 520 (428) (577)
Total comprehensive loss $ (8,677) $ (8,417) $ (11,218)
Net loss per share:      
Basic and diluted $ (0.27) $ (0.25) $ (0.31)
Weighted average number of shares used in per share computations of net loss:      
Basic and diluted 35,007,201 34,250,582 33,710,507
Product [Member]      
Revenues:      
Total revenues $ 92,524 $ 67,440 $ 56,169
Cost of revenues:      
Total cost of revenues 28,524 22,743 20,061
Service [Member]      
Revenues:      
Total revenues 43,398 42,660 39,668
Cost of revenues:      
Total cost of revenues $ 11,558 $ 11,091 $ 9,288