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SHARE-BASED COMPENSATION - RSU Rollforward (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
SHARE-BASED COMPENSATION
RSUs outstanding, beginning	5,801,841	5,691,899
Grants	1,251,000	1,958,000
Exercises	(435,002)	(760,329)
Forfeitures	(201,750)	(1,087,729)
RSUs outstanding, ending	6,416,089	5,801,841
RSUs vested, ending	3,307,840	1,997,677
RSUs outstanding, weighted average fair value, beginning	$ 0.80	$ 0.52
RSUs grants, weighted average fair value	2.08	1.44
RSUs exercises, weighted average fair value	0.82	0.56
RSUs forfeitures, weighted average fair value	1.04	0.63
RSUs outstanding, weighted average fair value, ending	1.04	0.80
RSUs vested, weighted average fair value, ending	$ 0.67	$ 0.59

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