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Consolidated Statements of Income - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:      
Revenues $ 77,877,000 $ 87,507,000 $ 72,653,000
Cost of revenues 7,951,000 6,953,000 6,086,000
Gross profit 69,926,000 80,554,000 66,567,000
Operating expenses:      
Research and development, net 47,755,000 40,385,000 30,838,000
Sales and marketing 12,161,000 12,572,000 11,540,000
General and administrative 10,354,000 10,488,000 8,567,000
Amortization of intangible assets (Note 6) 901,000 1,236,000 1,236,000
Total operating expenses 71,171,000 64,681,000 52,181,000
Operating income (loss) (1,245,000) 15,873,000 14,386,000
Financial income, net (Note 12) 3,418,000 3,026,000 2,039,000
Revaluation of investment in other company (Note 12) (870,000) 0 0
Income before taxes on income 1,303,000 18,899,000 16,425,000
Income taxes (Note 13) 729,000 1,871,000 3,325,000
Net income $ 574,000 $ 17,028,000 $ 13,100,000
Basic net income per share (in dollars per share) $ 0.03 $ 0.78 $ 0.63
Diluted net income per share (in dollars per share) $ 0.03 $ 0.75 $ 0.61
Weighted average shares used to compute net income per share (in thousands):      
Basic (in shares) 22,034 21,771 20,850
Diluted (in shares) 22,503 22,561 21,565
License [Member]      
Revenues:      
Revenues $ 40,446,000 $ 42,899,000 $ 31,874,000
Royalty [Member]      
Revenues:      
Revenues $ 37,431,000 $ 44,608,000 $ 40,779,000