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Revenue Recognition - Schedule of Disaggregated Revenue By Major Product Line in Single Reporting Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Service $ 3,507 $ 3,696
Subscription 1,578 1,445
License 528 950
Total revenue 5,613 $ 6,091
Guardian [Member]    
Disaggregation Of Revenue [Line Items]    
Subscription 989  
Digimarc Discover and Digimarc Barcode [Member]    
Disaggregation Of Revenue [Line Items]    
Subscription $ 589