REVENUE - Effect on Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Revenues	$ 71,026	$ 68,038	$ 139,903	$ 134,593
Operating expenses
Direct costs and expenses for advisors	40,153	40,253	83,137	80,939
Selling, general and administrative	24,680	23,380	46,908	45,105
Depreciation and amortization	1,993	3,859	3,895	6,822
Operating income	4,200	546	5,963	1,727
Interest income	3	34	110	79
Interest expense	(1,728)	(1,707)	(3,465)	(3,416)
Foreign currency transaction gain	49	(101)	25	(181)
Income (loss) before taxes	2,524	(1,228)	2,633	(1,791)
Income tax provision (benefit)	162	(923)	107	(915)
Net income (loss)	2,362	$ (305)	2,526	$ (876)
ASU 2014-09 (“ASC Topic 606”) | Adjustments
Revenue
Revenues	(419)		(3,966)
Operating expenses
Direct costs and expenses for advisors	469		(1,019)
Operating income	(888)		(2,947)
Income (loss) before taxes	(888)		(2,947)
Income tax provision (benefit)	(213)		(707)
Net income (loss)	(675)		(2,240)
ASU 2014-09 (“ASC Topic 606”) | As Previously Reported Under ASC 605
Revenue
Revenues	70,607		135,937
Operating expenses
Direct costs and expenses for advisors	40,622		82,118
Selling, general and administrative	24,680		46,908
Depreciation and amortization	1,993		3,895
Operating income	3,312		3,016
Interest income	3		110
Interest expense	(1,728)		(3,465)
Foreign currency transaction gain	49		25
Income (loss) before taxes	1,636		(314)
Income tax provision (benefit)	(51)		(600)
Net income (loss)	$ 1,687		$ 286