Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total	$ 12,658	$ 12,707
Fixed Price [Member]
Total	9,049	10,132
Cost Reimbursement [Member]
Total
Time and Materials [Member]
Total	3,609	2,575
Treatment [Member]
Total	8,959	10,034
Treatment [Member] \| Fixed Price [Member]
Total	8,959	10,034
Treatment [Member] \| Cost Reimbursement [Member]
Total
Treatment [Member] \| Time and Materials [Member]
Total
Services [Member]
Total	3,699	2,673
Services [Member] \| Fixed Price [Member]
Total	90	98
Services [Member] \| Cost Reimbursement [Member]
Total
Services [Member] \| Time and Materials [Member]
Total	3,609	2,575
Domestic Government [Member]
Total	9,654	9,439
Domestic Government [Member] \| Treatment [Member]
Total	6,536	7,371
Domestic Government [Member] \| Services [Member]
Total	3,118	2,068
Domestic Commercial [Member]
Total	2,825	3,182
Domestic Commercial [Member] \| Treatment [Member]
Total	2,423	2,663
Domestic Commercial [Member] \| Services [Member]
Total	402	519
Foreign Government [Member]
Total	153	65
Foreign Government [Member] \| Treatment [Member]
Total
Foreign Government [Member] \| Services [Member]
Total	153	65
Foreign Commercial [Member]
Total	26	21
Foreign Commercial [Member] \| Treatment [Member]
Total
Foreign Commercial [Member] \| Services [Member]
Total	$ 26	$ 21