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Schedule of Changes in Accumulated Balances of Other Comprehensive Income (Loss), Net of Taxes (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Revenues:          
Revenues $ 21,413 $ 24,044 $ 56,476 $ 65,906  
Cost of revenues 2,006 1,726 5,966 5,030  
Gross profit 19,407 22,318 50,510 60,876  
Operating expenses:          
Sales and marketing 2,727 3,057 9,302 9,422  
Other operating expenses 14,528   44,625    
Total operating expenses 17,255 16,108 53,927 48,150  
Operating income (loss) 2,152 6,210 (3,417) 12,726  
Financial income, net 831 821 2,535 2,147  
Income (loss) before taxes on income 2,983 7,031 (882) 14,873  
Income taxes expenses (benefit) 440 1,181 847 1,008  
Net income (loss) $ 2,543 $ 5,850 $ (1,729) $ 13,865  
Basic net income (loss) per share $ 0.12 $ 0.27 $ (0.08) $ 0.64  
Diluted net income (loss) per share $ 0.11 $ 0.26 $ (0.08) $ 0.62  
Assets:          
Trade receivables $ 7,577   $ 7,577   $ 14,480
Accrued revenues 16,456   16,456   2,014
Prepaid expenses and other current assets 5,904   5,904   3,747
Liabilities:          
Deferred revenues 3,614   3,614   4,399
Stockholders' equity:          
Retained earnings 60,570   60,570   $ 53,873
Licensing and Related Revenue          
Revenues:          
Revenues 9,786 $ 14,021 29,907 $ 33,893  
Royalties          
Revenues:          
Revenues 11,627 $ 10,023 26,569 $ 32,013  
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09          
Revenues:          
Revenues 17,468   53,604    
Cost of revenues 2,006   5,966    
Gross profit 15,462   47,638    
Operating expenses:          
Sales and marketing 2,729   9,186    
Other operating expenses 14,528   44,625    
Total operating expenses 17,257   53,811    
Operating income (loss) (1,795)   (6,173)    
Financial income, net 831   2,535    
Income (loss) before taxes on income (964)   (3,638)    
Income taxes expenses (benefit) (112)   657    
Net income (loss) $ (852)   $ (4,295)    
Basic net income (loss) per share $ (0.04)   $ (0.19)    
Diluted net income (loss) per share $ (0.04)   $ (0.19)    
Assets:          
Trade receivables $ 6,718   $ 6,718    
Accrued revenues 5,269   5,269    
Prepaid expenses and other current assets 6,856   6,856    
Liabilities:          
Deferred revenues 3,641   3,641    
Stockholders' equity:          
Retained earnings 49,449   49,449    
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09 | Licensing and Related Revenue          
Revenues:          
Revenues 10,131   28,730    
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09 | Royalties          
Revenues:          
Revenues 7,337   24,874    
Effect of change higher/(lower) | ASU 2014-09          
Revenues:          
Revenues 3,945   2,872    
Gross profit 3,945   2,872    
Operating expenses:          
Sales and marketing (2)   116    
Total operating expenses (2)   116    
Operating income (loss) 3,947   2,756    
Income (loss) before taxes on income 3,947   2,756    
Income taxes expenses (benefit) 552   190    
Net income (loss) $ 3,395   $ 2,566    
Basic net income (loss) per share $ 0.15   $ 0.12    
Diluted net income (loss) per share $ 0.15   $ 0.12    
Assets:          
Trade receivables $ 859   $ 859    
Accrued revenues 11,187   11,187    
Prepaid expenses and other current assets (952)   (952)    
Liabilities:          
Deferred revenues (27)   (27)    
Stockholders' equity:          
Retained earnings 11,121   11,121    
Effect of change higher/(lower) | ASU 2014-09 | Licensing and Related Revenue          
Revenues:          
Revenues (345)   1,177    
Effect of change higher/(lower) | ASU 2014-09 | Royalties          
Revenues:          
Revenues $ 4,290   $ 1,695