Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 37,176	$ 38,917	$ 111,655	$ 123,583
Tech-Focused [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	37,176	37,986	111,655	114,271
Corporate & Other Segment [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	931	0	9,312
Dice [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	22,915	23,715	69,276	70,486
Dice [Member] | Tech-Focused [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	22,915	23,715	69,276	70,486
Dice [Member] | Corporate & Other Segment [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	0	0	0
ClearanceJobs [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,320	5,422	18,116	15,359
ClearanceJobs [Member] | Tech-Focused [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,320	5,422	18,116	15,359
ClearanceJobs [Member] | Corporate & Other Segment [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	0	0	0
Dice Europe [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	461	0	3,008
Dice Europe [Member] | Tech-Focused [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	461	0	3,008
Dice Europe [Member] | Corporate & Other Segment [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	0	0	0
eFinancial Careers [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,941	8,388	24,263	25,418
eFinancial Careers [Member] | Tech-Focused [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,941	8,388	24,263	25,418
eFinancial Careers [Member] | Corporate & Other Segment [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	0	0	0
Hcareers [Member] | Corporate & Other Segment [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue			0	5,329
Hospitality [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue			0	5,329
Hospitality [Member] | Tech-Focused [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue			0	0
Rigzone [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	931	0	3,771
Rigzone [Member] | Tech-Focused [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	0	0	0	0
Rigzone [Member] | Corporate & Other Segment [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 0	$ 931	0	3,771
Biospace [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue			0	212
Biospace [Member] | Tech-Focused [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue			0	0
Biospace [Member] | Corporate & Other Segment [Member]
Disaggregation of Revenue [Line Items]
Disaggregated revenue			$ 0	$ 212