Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 108,596	$ 84,890	$ 337,428	$ 258,992
Operating expenses:
Selling and marketing	41,605	31,051	127,655	96,771
General and administrative	13,533	11,192	39,944	32,871
Depreciation	2,121	1,965	6,310	6,056
Amortization of intangible assets	5,654	402	16,963	770
Acquisition and integration costs	2,394	977	7,848	1,306
Total operating expenses	110,236	79,948	345,330	245,311
Income (loss) from operations	(1,640)	4,942	(7,902)	13,681
Interest expense	(1,904)		(6,341)
Other income (expense), net	127	319	(229)	472
Losses on investments, net	(17)	(17)	(61)	(62)
Income (loss) before income taxes	(3,434)	5,244	(14,533)	14,091
Income tax expense (benefit)	(735)	1,294	(73)	4,086
Net income (loss)	$ (2,699)	$ 3,950	$ (14,460)	$ 10,005
Basic income (loss) per common share	$ (0.15)	$ 0.22	$ (0.78)	$ 0.55
Diluted income (loss) per common share	$ (0.15)	$ 0.21	$ (0.78)	$ 0.55
Basic weighted average common shares outstanding	18,546	18,088	18,448	18,030
Diluted weighted average common shares outstanding	18,546	18,433	18,448	18,353
Cash dividends declared per common share		$ 0.20		$ 0.60
Research Services [Member]
Revenues:
Total revenues	$ 74,548	$ 56,332	$ 219,436	$ 166,332
Advisory Services and Events [Member]
Revenues:
Total revenues	34,048	28,558	117,992	92,660
Cost of Services and Fulfillment [Member]
Operating expenses:
Cost of services and fulfillment	$ 44,929	$ 34,361	$ 146,610	$ 107,537