Operating Segments and Related Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment information
Revenue, net	$ 41,974	$ 42,102	$ 80,778	$ 78,823
Net loss from continuing operations	(4,176)	(2,880)	(8,417)	(5,208)
Income tax expense	311	189	479	976
Interest expense, net	592	486	1,065	884
EBIT	(3,273)	(2,205)	(6,873)	(3,348)
Depreciation of property, equipment and software	2,381	2,360	4,584	3,583
Amortization of intangible assets	872	864	1,734	1,652
EBITDA	(20)	1,019	(555)	1,887
Other loss	11	5	(8)	17
Foreign currency transaction (gains) losses on short-term intercompany balances	(77)	880	129	660
Transformation, severance, and other expenses	1,280	1,315	1,977	1,989
Stock-based compensation	1,662	873	3,046	2,818
Adjusted EBITDA	2,856	4,092	4,589	7,371
Recovery Audit Services - Americas [Member]
Segment information
Revenue, net	28,935	28,912	56,308	54,870
EBIT	6,960	4,598	12,964	10,323
Depreciation of property, equipment and software	1,919	1,719	3,681	2,616
Amortization of intangible assets	438	436	876	773
EBITDA	9,317	6,753	17,521	13,712
Other loss	1	0	1	0
Foreign currency transaction (gains) losses on short-term intercompany balances	(106)	149	(179)	206
Transformation, severance, and other expenses	250	486	378	549
Stock-based compensation	0	0	0	0
Adjusted EBITDA	9,462	7,388	17,721	14,467
Recovery Audit Services - Europe/Asia-Pacific [Member]
Segment information
Revenue, net	11,836	11,445	21,595	21,472
EBIT	1,877	1,669	2,190	3,217
Depreciation of property, equipment and software	182	206	344	348
Amortization of intangible assets	48	38	85	99
EBITDA	2,107	1,913	2,619	3,664
Other loss	0	56	9	105
Foreign currency transaction (gains) losses on short-term intercompany balances	(99)	905	300	676
Transformation, severance, and other expenses	122	472	245	1,015
Stock-based compensation	0	0	0	0
Adjusted EBITDA	2,130	3,346	3,173	5,460
Adjacent Services [Member]
Segment information
Revenue, net	1,203	1,745	2,875	2,481
EBIT	(2,914)	(1,058)	(5,059)	(2,779)
Depreciation of property, equipment and software	280	435	559	619
Amortization of intangible assets	386	390	773	780
EBITDA	(2,248)	(233)	(3,727)	(1,380)
Other loss	0	0	0	0
Foreign currency transaction (gains) losses on short-term intercompany balances	6	13	0	4
Transformation, severance, and other expenses	605	0	623	68
Stock-based compensation	0	0	0	0
Adjusted EBITDA	(1,637)	(220)	(3,104)	(1,308)
Corporate Support [Member]
Segment information
EBIT	(9,196)	(7,414)	(16,968)	(14,109)
Depreciation of property, equipment and software	0	0	0	0
Amortization of intangible assets	0	0	0	0
EBITDA	(9,196)	(7,414)	(16,968)	(14,109)
Other loss	10	(51)	(18)	(88)
Foreign currency transaction (gains) losses on short-term intercompany balances	122	(187)	8	(226)
Transformation, severance, and other expenses	303	357	731	357
Stock-based compensation	1,662	873	3,046	2,818
Adjusted EBITDA	$ (7,099)	$ (6,422)	$ (13,201)	$ (11,248)