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Segment Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Segment
Sep. 30, 2016
USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]        
Number of reportable business segments | Segment     2  
Segment Reporting Information, Profit (Loss) [Abstract]        
Total revenue $ 15,409 $ 14,428 $ 48,876 $ 39,820
Change in fair value of contingent consideration, net (139) 525 (436) 370
Operating income (loss) (632) 433 73 875
Interest income, net 15 11 60 52
Gain (loss) on derivative instruments, net 71 (211) 226 (346)
Other income (expense), net 33 15 (4) 112
Income (loss) before income taxes (513) 248 355 693
Performance Improvement Solutions [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total revenue 8,737 10,215 30,093 27,382
Operating income (loss) (1,545) (413) (1,885) (890)
Nuclear Industry Training and Consulting [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total revenue 6,672 4,213 18,783 12,438
Operating income (loss) $ 1,052 $ 321 $ 2,394 $ 1,395
Minimum [Member] | Performance Improvement Solutions [Member]        
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]        
Contract term     9 months  
Maximum [Member] | Performance Improvement Solutions [Member]        
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]        
Contract term     24 months