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Goodwill and Intangible Assets (Details)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Feb. 15, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment
Dec. 31, 2018
USD ($)
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 $ 13,170 $ 13,170 $ 13,170 $ 8,431
Acquisition         5,766 4,739
Dispositions         0 0
Goodwill impairment loss         (5,597) 0
Net book value, ending balance   13,339 13,339 13,339 13,339 13,170
Amortized Intangible Assets [Abstract]            
Gross carrying amount         16,744 9,945
Accumulated amortization         (6,265) (3,865)
Net         10,479 6,080
Amortization of definite-lived intangible assets   570 1,208 1,804 2,400 1,612
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
2020         2,808  
2021         2,143  
2022         1,626  
2023         1,199  
Thereafter         2,703  
Total         10,479 6,080
Customer Relationships [Member]            
Amortized Intangible Assets [Abstract]            
Gross carrying amount         11,730 6,831
Accumulated amortization         (4,079) (2,375)
Net         7,651 4,456
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
Total         7,651 4,456
Trade Names [Member]            
Amortized Intangible Assets [Abstract]            
Gross carrying amount         2,467 1,295
Accumulated amortization         (727) (318)
Net         1,740 977
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
Total         1,740 977
Developed Technology [Member]            
Amortized Intangible Assets [Abstract]            
Gross carrying amount         471 471
Accumulated amortization         (471) (471)
Net         0 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
Total         0 0
Non-Controlling Customer Relationships [Member]            
Amortized Intangible Assets [Abstract]            
Gross carrying amount         433 433
Accumulated amortization         (433) (433)
Net         0 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
Total         0 0
Noncompete Agreement [Member]            
Amortized Intangible Assets [Abstract]            
Gross carrying amount         949 221
Accumulated amortization         (217) (35)
Net         732 186
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
Total         732 186
Alliance Agreement [Member]            
Amortized Intangible Assets [Abstract]            
Gross carrying amount         527 527
Accumulated amortization         (171) (66)
Net         356 461
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
Total         356 461
Others [Member]            
Amortized Intangible Assets [Abstract]            
Gross carrying amount         167 167
Accumulated amortization         (167) (167)
Net         0 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
Total         0 0
Performance Improvement Solutions [Member]            
Goodwill [Roll Forward]            
Net book value, beginning balance   4,739 4,739 4,739 4,739 0
Acquisition         5,766 4,739
Dispositions         0 0
Goodwill impairment loss         (5,597) 0
Net book value, ending balance         4,908 4,739
Amortized Intangible Assets [Abstract]            
Amortization of definite-lived intangible assets         1,871 898
Nuclear Industry Training and Consulting [Member]            
Goodwill [Roll Forward]            
Net book value, beginning balance   $ 8,431 $ 8,431 $ 8,431 8,431 8,431
Acquisition         0 0
Dispositions         0 0
Goodwill impairment loss         0 0
Net book value, ending balance         8,431 8,431
Amortized Intangible Assets [Abstract]            
Amortization of definite-lived intangible assets         529 $ 714
DP Engineering Ltd, CO. [Member]            
Goodwill [Roll Forward]            
Acquisition         5,800  
Goodwill impairment loss         (5,600)  
Net book value, ending balance $ 5,766          
Amortized Intangible Assets [Abstract]            
Definite-lived Intangible assets acquired 6,798       $ 6,798  
DP Engineering Ltd, CO. [Member] | Minimum [Member]            
Amortized Intangible Assets [Abstract]            
Amortization term of intangible assets acquired         5 years  
Revised cash flow projected         5 years  
DP Engineering Ltd, CO. [Member] | Maximum [Member]            
Amortized Intangible Assets [Abstract]            
Amortization term of intangible assets acquired         15 years  
Revised cash flow projected         15 years  
DP Engineering Ltd, CO. [Member] | Customer Relationships [Member]            
Amortized Intangible Assets [Abstract]            
Definite-lived Intangible assets acquired 4,898          
DP Engineering Ltd, CO. [Member] | Noncompete Agreement [Member]            
Amortized Intangible Assets [Abstract]            
Definite-lived Intangible assets acquired $ 728