| Document and Entity Information | Feb. 24, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 24, 2021 |
| Entity Registrant Name | DIGIMARC CORP |
| Entity Central Index Key | 0001438231 |
| Entity Incorporation State Country Code | OR |
| Entity File Number | 001-34108 |
| Entity Tax Identification Number | 26-2828185 |
| Entity Address, Address Line One | 9405 SW Gemini Drive |
| Entity Address, City or Town | Beaverton |
| Entity Address, State or Province | OR |
| Entity Address, Postal Zip Code | 97008 |
| City Area Code | (503) |
| Local Phone Number | 469-4800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.001 Par Value Per Share |
| Trading Symbol | DMRC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
