Goodwill and Intangible Assets (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 15, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets [Abstract]
Number of reporting units | Segment				2
Number of operating segments | Segment				2
Goodwill [Roll Forward]
Net book value, beginning balance				$ 13,170
Acquisition				5,633
Dispositions				0
Goodwill impairment loss				(2,094)
Net book value, ending balance		$ 16,709		16,709
Amortized Intangible Assets [Abstract]
Gross carrying amount		9,946		9,946		$ 9,945
Accumulated amortization		(4,920)		(4,920)		(3,865)
Addition				6,798
Impairment				(3,370)
Net		8,454		8,454		6,080
Amortization of definite-lived intangible assets		547	$ 312	1,056	$ 462
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019		990		990
2020		1,973		1,973
2021		1,470		1,470
2022		1,152		1,152
2023		868		868
Thereafter		2,001		2,001
Total		8,454		8,454		6,080
Customer Relationships [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount		6,832		6,832		6,831
Accumulated amortization		(3,098)		(3,098)		(2,375)
Addition				4,898
Impairment				(3,370)
Net		5,262		5,262		4,456
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total		5,262		5,262		4,456
Trade Names [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount		1,295		1,295		1,295
Accumulated amortization		(515)		(515)		(318)
Addition				1,172
Impairment				0
Net		1,952		1,952		977
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total		1,952		1,952		977
Developed Technology [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount		471		471		471
Accumulated amortization		(471)		(471)		(471)
Net		0		0		0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total		0		0		0
Non-Controlling Customer Relationships [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount		433		433		433
Accumulated amortization		(433)		(433)		(433)
Net		0		0		0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total		0		0		0
Noncompete Agreements [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount		221		221		221
Accumulated amortization		(117)		(117)		(35)
Addition				728
Impairment				0
Net		832		832		186
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total		832		832		186
Alliance Agreement [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount		527		527		527
Accumulated amortization		(119)		(119)		(66)
Net		408		408		461
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total		408		408		461
Others [Member]
Amortized Intangible Assets [Abstract]
Gross carrying amount		167		167		167
Accumulated amortization		(167)		(167)		(167)
Net		0		0		0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total		0		0		$ 0
Performance Improvement Solutions [Member]
Goodwill [Roll Forward]
Net book value, beginning balance				4,739
Acquisition				5,633
Dispositions				0
Goodwill impairment loss				(2,094)
Net book value, ending balance		8,278		8,278
Nuclear Industry Training and Consulting [Member]
Goodwill [Roll Forward]
Net book value, beginning balance				8,431
Acquisition				0
Dispositions				0
Goodwill impairment loss				0
Net book value, ending balance		$ 8,431		$ 8,431
DP Engineering Ltd, CO. [Member]
Goodwill [Roll Forward]
Net book value, ending balance	$ 5,633
Amortized Intangible Assets [Abstract]
Addition	6,798
DP Engineering Ltd, CO. [Member] | Minimum [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization term of intangible assets acquired				5 years
DP Engineering Ltd, CO. [Member] | Maximum [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization term of intangible assets acquired				15 years
DP Engineering Ltd, CO. [Member] | Customer Relationships [Member]
Amortized Intangible Assets [Abstract]
Addition	4,898
DP Engineering Ltd, CO. [Member] | Noncompete Agreements [Member]
Amortized Intangible Assets [Abstract]
Addition	$ 728