Segment Information (Details) $ in Thousands	2 Months Ended	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)		Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)		May 11, 2018
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Number of reportable business segments | Segment					2
Contract term					2 years
Segment Reporting Information, Profit (Loss) [Abstract]
Total revenue		$ 24,698	$ 17,125	[1]	$ 47,593	$ 33,467	[1]
Change in fair value of contingent consideration, net		0	(43)		0	(297)
Operating income (loss)		680	762		(448)	705
Interest (expense) income, net		(61)	18		(39)	45
(Loss) gain on derivative instruments, net		(91)	315		(247)	155
Other income (expense), net		4	(34)		29	(37)
Income (loss) before income taxes		532	1,061		(705)	868
Performance Improvement Solutions [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Total revenue		10,864	11,686		20,765	21,356
Operating income (loss)		619	997		(171)	886
Nuclear Industry Training and Consulting [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Overhead costs		962	598		2,136	1,226
Segment Reporting Information, Profit (Loss) [Abstract]
Total revenue		13,834	5,439		26,828	12,111
Operating income (loss)		$ 61	$ (192)		$ (277)	$ 116
True North Consulting, LLC [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Percentage of ownership interest acquired								100.00%
Segment Reporting Information, Profit (Loss) [Abstract]
Total revenue	$ 1,275

[1] Prior period amounts have not been adjusted under the modified retrospective transition method for the adoption of ASC 606.