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Stock-Based Compensation - Additional Information (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted 0 0 0  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for stock options and restricted stock   3 years    
Contractual terms   10 years    
Stock-based compensation plans, number of additional shares authorized for future grants   1,388,000    
Closing price per share of Digimarc common stock       $ 44.39
Restricted Stock [Member] | Minimum [Member] | Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for stock options and restricted stock   3 years    
Restricted Stock [Member] | Minimum [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for stock options and restricted stock   1 year    
Restricted Stock [Member] | Maximum [Member] | Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for stock options and restricted stock   4 years    
Restricted Stock [Member] | Maximum [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period for stock options and restricted stock   3 years