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Property, Plant, and Equipment - Additional Information (Details) - USD ($)		3 Months Ended
	Jul. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Property Plant And Equipment [Abstract]
Exercised option to purchase	$ 460,300
Depreciation expense		$ 38,800	$ 47,600

X

- Definition

Exercised option to purchase.

+ References

No definition available.

+ Details

Name:	dcth_ExercisedOptionToPurchase
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

property plant and equipment as depreciation expense.

+ References

No definition available.

+ Details

Name:	dcth_PropertyPlantAndEquipmentDepreciationExpense
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration