Operating Segments and Related Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment information
Revenue, net of refund liabilities	$ 43,320	$ 42,467	$ 122,143	$ 114,546
Net income from continuing operations	2,626	1,077	(2,582)	(1,096)
Income tax expense	597	930	1,573	2,436
Interest expense, net	416	142	1,300	227
EBIT	3,639	2,149	291	1,567
Depreciation of property and equipment	1,713	1,133	5,296	3,462
Amortization of intangible assets	872	722	2,524	2,166
EBITDA	6,224	4,004	8,111	7,195
Other (income) loss	(1)	17	16	(177)
Foreign currency transaction (gains) losses on short-term intercompany balances	70	(418)	730	(1,927)
Transformation severance and related expenses	439	692	2,428	1,592
Stock-based compensation	1,341	2,107	4,159	5,362
Adjusted EBITDA	6,433	6,402	13,804	12,045
Recovery Audit Services - Americas [Member]
Segment information
Revenue, net of refund liabilities	28,806	30,705	83,676	81,641
EBIT	6,522	8,539	16,845	20,110
Depreciation of property and equipment	1,260	789	3,876	2,478
Amortization of intangible assets	445	329	1,218	986
EBITDA	8,227	9,657	21,939	23,574
Other (income) loss	(3)	(11)	(3)
Foreign currency transaction (gains) losses on short-term intercompany balances	(78)	(155)	128	(396)
Transformation severance and related expenses	179	49	728	313
Stock-based compensation	0	0	0	0
Adjusted EBITDA	8,325	9,540	22,792	23,480
Recovery Audit Services - Europe/Asia-Pacific [Member]
Segment information
Revenue, net of refund liabilities	12,191	10,837	33,663	29,441
EBIT	2,585	2,289	5,802	5,754
Depreciation of property and equipment	164	161	512	453
Amortization of intangible assets	37	0	136	0
EBITDA	2,786	2,450	6,450	6,207
Other (income) loss	61	0	166
Foreign currency transaction (gains) losses on short-term intercompany balances	177	(377)	853	(1,566)
Transformation severance and related expenses	(16)	360	999	582
Stock-based compensation	0	0	0	0
Adjusted EBITDA	3,008	2,433	8,468	5,223
Adjacent Services [Member]
Segment information
Revenue, net of refund liabilities	2,323	925	4,804	3,464
EBIT	(847)	(2,026)	(3,626)	(5,681)
Depreciation of property and equipment	289	183	908	531
Amortization of intangible assets	390	393	1,170	1,180
EBITDA	(168)	(1,450)	(1,548)	(3,970)
Other (income) loss	0	(2)	0	(195)
Foreign currency transaction (gains) losses on short-term intercompany balances	10	(6)	14	(10)
Transformation severance and related expenses	(2)	260	66	305
Stock-based compensation	0	0	0	0
Adjusted EBITDA	(160)	(1,198)	(1,468)	(3,870)
Corporate Support [Member]
Segment information
EBIT	(4,621)	(6,653)	(18,730)	(18,616)
Depreciation of property and equipment	0	0	0	0
Amortization of intangible assets	0	0	0	0
EBITDA	(4,621)	(6,653)	(18,730)	(18,616)
Other (income) loss	(59)	30	(147)	29
Foreign currency transaction (gains) losses on short-term intercompany balances	(39)	120	(265)	45
Transformation severance and related expenses	278	23	635	392
Stock-based compensation	1,341	2,107	4,159	5,362
Adjusted EBITDA	$ (4,740)	$ (4,373)	$ (15,988)	$ (12,788)