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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenues:          
Revenues $ 17,494 $ 20,575 $ 35,063 $ 41,862  
Cost of revenues 1,988 1,608 3,960 3,304  
Gross profit 15,506 18,967 31,103 38,558  
Operating expenses:          
Sales and marketing 3,399 3,427 6,575 6,365  
Other operating expenses 14,768   30,097    
Total operating expenses 18,167 16,797 36,672 32,042  
Operating loss (2,661) 2,170 (5,569) 6,516  
Financial income, net 777 755 1,704 1,326  
Loss before taxes on income (1,884) 2,925 (3,865) 7,842  
Income taxes 206 (983) 407 (173)  
Net loss $ (2,090) $ 3,908 $ (4,272) $ 8,015  
Basic net loss per share $ (0.09) $ 0.18 $ (0.19) $ 0.37  
Diluted net loss per share $ (0.09) $ 0.17 $ (0.19) $ 0.36  
Assets:          
Trade receivables $ 9,246   $ 9,246   $ 14,480
Accrued revenues 8,753   8,753   2,014
Prepaid expenses and other current assets 6,244   6,244   3,747
Liabilities:          
Deferred revenues 2,717   2,717   4,399
Stockholders' equity:          
Retained earnings 58,068   58,068   $ 53,873
Licensing and Related Revenue          
Revenues:          
Revenues 10,038 $ 10,337 20,121 $ 19,872  
Royalties          
Revenues:          
Revenues 7,456 $ 10,238 14,942 $ 21,990  
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09          
Revenues:          
Revenues 16,604   36,136    
Cost of revenues 1,988   3,960    
Gross profit 14,616   32,176    
Operating expenses:          
Sales and marketing 3,291   6,457    
Other operating expenses 14,768   30,097    
Total operating expenses 18,059   36,554    
Operating loss (3,443)   (4,378)    
Financial income, net 777   1,704    
Loss before taxes on income (2,666)   (2,674)    
Income taxes 305   769    
Net loss $ (2,971)   $ (3,443)    
Basic net loss per share $ (0.13)   $ (0.16)    
Diluted net loss per share $ (0.13)   $ (0.16)    
Assets:          
Trade receivables $ 8,461   $ 8,461    
Accrued revenues 1,564   1,564    
Prepaid expenses and other current assets 6,648   6,648    
Liabilities:          
Deferred revenues 2,872   2,872    
Stockholders' equity:          
Retained earnings 50,343   50,343    
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09 | Licensing and Related Revenue          
Revenues:          
Revenues 9,035   18,599    
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09 | Royalties          
Revenues:          
Revenues 7,569   17,537    
Effect of change higher/(lower) | ASU 2014-09          
Revenues:          
Revenues 890   (1,073)    
Gross profit 890   (1,073)    
Operating expenses:          
Sales and marketing 108   118    
Total operating expenses 108   118    
Operating loss 782   (1,191)    
Loss before taxes on income 782   (1,191)    
Income taxes (99)   (362)    
Net loss $ 881   $ (829)    
Basic net loss per share $ 0.04   $ (0.04)    
Diluted net loss per share $ 0.04   $ (0.04)    
Assets:          
Trade receivables $ 785   $ 785    
Accrued revenues 7,189   7,189    
Prepaid expenses and other current assets (404)   (404)    
Liabilities:          
Deferred revenues (155)   (155)    
Stockholders' equity:          
Retained earnings 7,725   7,725    
Effect of change higher/(lower) | ASU 2014-09 | Licensing and Related Revenue          
Revenues:          
Revenues 1,003   1,522    
Effect of change higher/(lower) | ASU 2014-09 | Royalties          
Revenues:          
Revenues $ (113)   $ (2,595)