Segment Information, Loss before income taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues				$ 82,975	$ 92,249
Depreciation				363	515
Amortization of definite-lived intangible assets	$ 570	$ 1,208	$ 1,804	2,400	1,612
Operating (loss) income				(7,419)	1,366
Interest expense				(988)	(268)
Loss on derivative instruments				(13)	(350)
Other income (expense), net				2,068	29
Income (loss) before income taxes	$ (6,145)	$ (5,955)	$ (6,610)	(6,352)	777
Performance Improvement Solutions [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues				45,776	42,954
Depreciation				345	385
Amortization of definite-lived intangible assets				1,871	898
Operating (loss) income				(5,802)	2,640
Nuclear Industry Training and Consulting [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues				37,199	49,295
Depreciation				18	130
Amortization of definite-lived intangible assets				529	714
Operating (loss) income				$ (1,617)	$ (1,274)