Stock-Based Compensation - Additional Information (Detail) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	0	0	0	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation plans, number of additional shares authorized for future grants			1,319
Closing price per share of Digimarc common stock	$ 38.35		$ 38.35