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Segment Information (Details)
$ in Thousands
3 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Segment
Sep. 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 $ 20,031 $ 21,801   $ 65,683 $ 69,394    
Operating income (loss) (263) (26)   (5,537) (474)    
Loss on impairment 0 0   (5,464) 0    
Change in fair value of contingent consideration, net 0 0   1,200 0    
Interest (expense), net (288) (114)   (812) (153)    
Loss on derivative instruments, net (61) (59)   (69) (306)    
Other income (expense), net 59 (5)   62 24    
Loss before income taxes (553) (204)   (6,356) (909)    
Performance Improvement Solutions [Member]              
Segment Reporting Information, Profit (Loss) [Abstract]              
Revenue 11,417 9,849   36,617 30,614    
Operating income (loss) 77 494   285 110    
Nuclear Industry Training and Consulting [Member]              
Segment Reporting Information, Profit (Loss) [Abstract]              
Revenue 8,614 11,952   29,066 38,780    
Operating income (loss) $ (340) $ (520)   $ (1,558) $ (584)    
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     $ 6,493        
True North Consulting, LLC [Member]              
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]              
Percentage of ownership interest acquired             100.00%