Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Total revenues	$ 108,577	$ 108,596	$ 328,463	$ 337,428
Operating expenses:
Selling and marketing	42,209	41,605	121,599	127,655
General and administrative	12,475	13,533	35,936	39,944
Depreciation	2,544	2,121	7,398	6,310
Amortization of intangible assets	4,722	5,654	14,147	16,963
Acquisition and integration costs	328	2,394	3,815	7,848
Total operating expenses	108,403	110,236	316,337	345,330
Income (loss) from operations	174	(1,640)	12,126	(7,902)
Interest expense	(1,259)	(1,904)	(4,104)	(6,341)
Other income (expense), net	(274)	127	(165)	(229)
Gain (loss) on investments, net		(17)	2,365	(61)
Income (loss) before income taxes	(1,359)	(3,434)	10,222	(14,533)
Income tax expense (benefit)	2,401	(735)	2,658	(73)
Net income (loss)	$ (3,760)	$ (2,699)	$ 7,564	$ (14,460)
Basic income (loss) per common share	$ (0.20)	$ (0.15)	$ 0.40	$ (0.78)
Diluted income (loss) per common share	$ (0.20)	$ (0.15)	$ 0.40	$ (0.78)
Basic weighted average common shares outstanding	18,872	18,546	18,779	18,448
Diluted weighted average common shares outstanding	18,872	18,546	18,873	18,448
Research [Member]
Revenues:
Total revenues	$ 72,813	$ 74,548	$ 219,230	$ 219,436
Consulting [Member]
Revenues:
Total revenues	34,633	32,619	102,980	98,422
Events [Member]
Revenues:
Total revenues	1,131	1,429	6,253	19,570
Cost of Services and Fulfillment [Member]
Operating expenses:
Cost of services and fulfillment	$ 46,125	$ 44,929	$ 133,442	$ 146,610