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Share-Based Compensation - RSU Rollforward (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Share Based Compensation [Abstract] |  |
RSUs outstanding, beginning | 5,580,919 | 6,416,089
Grants | 1,878,000 | 1,507,000
Exercises | (374,168) | (2,157,835)
Forfeitures | (140,000) | (184,335)
RSUs outstanding, ending | 6,944,751 | 5,580,919
RSUs vested, ending | 4,050,083 | 3,189,921
RSUs outstanding, Weighted Average Fair Value, beginning | $ 1.2 | $ 1.04
RSUs grants, Weighted Average Fair Value | 2.58 | 1.52
RSUs exercises, Weighted Average Fair Value | 0.98 | 0.93
RSUs forfeitures, Weighted Average Fair Value | 2.21 | 1.65
RSUs outstanding, Weighted Average Fair Value, ending | 1.56 | 1.2
RSUs vested, Weighted Average Fair Value, ending | $ 1.08 | $ 0.85

X
- Definition The number of RSUs outstanding in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_NumberOfOutstandingRSUs
Namespace Prefix: | dnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of RSUs exercised in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_NumberOfRSUsExercisedInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of RSUs forfeited in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_NumberOfRSUsForfeitedInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of share options granted in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_NumberOfRSUsGrantedInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of RSUs vested in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_NumberOfRSUsVestedInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | dnn_ShareBasedCompensationAbstract
Namespace Prefix: | dnn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average exercise price of RSUs exercised in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_WeightedAverageFairValueOfRSUsExercisedInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average exercise price of RSUs forfeited in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_WeightedAverageFairValueOfRSUsForfeitedInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average exercise price of RSUs granted in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_WeightedAverageFairValueOfRSUsGrantedInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average exercise price of RSUs outstanding in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_WeightedAverageFairValueOfRSUsOutstandingInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average exercise price of RSUs vested in a share-based payment arrangement. + References No definition available. + Details
Name: | dnn_WeightedAverageFairValueOfRSUsVestedInSharebasedPaymentArrangement
Namespace Prefix: | dnn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant