Property, Plant, and Equipment - Additional Information (Details) - USD ($)		3 Months Ended	9 Months Ended
Jul. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Exercised option to purchase	$ 460,300
Depreciation expense		$ 32,700	$ 45,800	$ 124,700	$ 168,000

property plant and equipment as depreciation expense.

No definition available.

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