Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	May 11, 2018	Sep. 17, 2017
Goodwill [Roll Forward]
Net book value, beginning balance	$ 8,431	$ 5,612
Acquisition	4,739	2,819
Dispositions	0	0
Goodwill impairment loss	0	0
Net book value, ending balance	13,170	8,431
Amortized Intangible Assets [Abstract]
Gross carrying amount	9,945	4,858
Accumulated amortization	(3,865)	(2,254)
Total	6,080	2,604
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019	1,654
2020	1,332
2021	903
2022	674
2023	455
Thereafter	1,062
Total	6,080	2,604
Amortization of definite-lived intangible assets	1,612	335
Customer Relationships [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount	6,831	3,074
Accumulated amortization	(2,375)	(1,218)
Total	4,456	1,856
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	4,456	1,856
Trade Names [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount	1,295	713
Accumulated amortization	(318)	(33)
Total	977	680
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	977	680
Developed Technology [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount	471	471
Accumulated amortization	(471)	(412)
Total	0	59
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	0	59
Non Contractual Customer Relationships [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount	433	433
Accumulated amortization	(433)	(426)
Total	0	7
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	0	7
Noncompete Agreements [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount	221
Accumulated amortization	(35)
Total	186
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	186
Alliance Agreement [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount	527
Accumulated amortization	(66)
Total	461
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	461
Others [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount	167	167
Accumulated amortization	(167)	(165)
Total	0	2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	0	2
Performance Improvement Solutions [Member]
Goodwill [Roll Forward]
Net book value, beginning balance	0	0
Acquisition	4,739	0
Dispositions	0	0
Goodwill impairment loss	0	0
Net book value, ending balance	4,739	0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of definite-lived intangible assets	898	246
Nuclear Industry Training and Consulting [Member]
Goodwill [Roll Forward]
Net book value, beginning balance	8,431	5,612
Acquisition	0	2,819
Dispositions	0	0
Goodwill impairment loss	0	0
Net book value, ending balance	8,431	8,431
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of definite-lived intangible assets	$ 714	$ 89
True North Consulting, LLC [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Addition of Intangible Assets due to Acquisition of True North			$ 5,088
True North Consulting, LLC [Member] | Minimum [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization term of intangible assets acquired (TNC)	4 years
True North Consulting, LLC [Member] | Maximum [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization term of intangible assets acquired (TNC)	15 years
Absolute Consulting, Inc. [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Addition of Intangible Assets due to Acquisition of True North				$ 2,569