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Segment Information (Details)
$ in Thousands
3 Months Ended 5 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Segment
Jun. 30, 2018
USD ($)
Feb. 15, 2019
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]              
Revenue $ 23,458 $ 24,698   $ 45,652 $ 47,593    
Operating income (loss) 717 680   (5,274) (448)    
Loss on impairment 0 0   (5,464) 0    
Change in fair value of contingent consideration, net 0 0   1,200 0    
Interest (expense), net (316) (61)   (524) (39)    
Loss on derivative instruments, net (101) (91)   (8) (247)    
Other (expense) income, net (19) 4   3 29    
Income (loss) before income taxes 281 532   (5,803) (705)    
Performance Improvement Solutions [Member]              
Segment Reporting Information, Profit (Loss) [Abstract]              
Revenue 13,010 10,864   25,200 20,765    
Operating income (loss) 1,010 619   208 (171)    
Nuclear Industry Training and Consulting [Member]              
Segment Reporting Information, Profit (Loss) [Abstract]              
Revenue 10,448 13,834   20,452 26,828    
Operating income (loss) $ (293) $ 61   $ (1,218) $ (277)    
DP Engineering Ltd, Co [Member]              
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]              
Percentage of ownership interest acquired           100.00%  
Segment Reporting Information, Profit (Loss) [Abstract]              
Revenue     $ 4,325        
True North Consulting, LLC [Member]              
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]              
Percentage of ownership interest acquired             100.00%