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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

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