Revenue (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2019 USD ($) Stream Obligation	Mar. 31, 2018 USD ($)		Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Abstract]
Revenue	$ 22,194	$ 22,895	[1]
Number of broad revenue streams | Stream	3
Contract with Customer, Asset and Liability [Abstract]
Billings in excess of revenue earned (BIE)	$ 7,511			$ 10,609
Revenue recognized in the period from amounts included in BIE at the beginning of the period	5,040			$ 11,275
Amount of revenue recognized related to performance obligations satisfied in previous periods	$ 824
Revenue, Performance Obligation [Abstract]
Number of performance obligations | Obligation	2
Remaining performance obligation	$ 33,702
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue, Performance Obligation [Abstract]
Expected period to recognize revenue as performance obligations are satisfied	12 months
Performance Improvement Solutions [Member]
Disaggregation of Revenue [Abstract]
Revenue	$ 12,190	9,901
Performance Improvement Solutions [Member] | System Design and Build [Member]
Disaggregation of Revenue [Abstract]
Revenue	6,442	7,495	[1]
Performance Improvement Solutions [Member] | Software [Member]
Disaggregation of Revenue [Abstract]
Revenue	749	869	[1]
Performance Improvement Solutions [Member] | Training and Consulting Services [Member]
Disaggregation of Revenue [Abstract]
Revenue	4,999	1,537	[1]
Nuclear Industry Training and Consulting [Member]
Disaggregation of Revenue [Abstract]
Revenue	10,004	12,994
Nuclear Industry Training and Consulting [Member] | Training and Consulting Services [Member]
Disaggregation of Revenue [Abstract]
Revenue	$ 10,004	$ 12,994	[1]

[1] Prior period amounts have not been adjusted under the modified retrospective transition method for the adoption of ASC 606.