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Note 12 - Leases (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Lessee, Operating Lease, Liability, to be Paid | $ 8,144 |  | $ 8,144 |
Operating Lease, Impairment Loss | 0 | $ 0 | 0 | $ 250
Corporate Office in Beaverton, Oregon [Member] |  |  |  |
Lessee, Operating Lease, Liability, to be Paid | 8,116 |  | 8,116 |
Former Corporate Office in Beaverton, Oregon [Member] |  |  |  |
Lessee, Operating Lease, Liability, to be Paid | $ 0 |  | $ 0 |

X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
Name: | us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479365/842-20-25-6 + Details
Name: | us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=dmrc_CorporateOfficeInBeavertonOregonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=dmrc_FormerCorporateOfficeInBeavertonOregonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |