Revenue - Schedule of Disaggregation of Revenue (Details)

Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net revenues	$ 11,984	$ 11,758	$ 37,801	$ 37,179
Fixed Price [Member]
Net revenues	9,407	9,738	28,247	29,642
Cost Reimbursement [Member]
Net revenues
Time and Materials [Member]
Net revenues	2,577	2,020	9,554	7,537
Treatment [Member]
Net revenues	9,103	9,355	27,207	29,019
Treatment [Member] \| Fixed Price [Member]
Net revenues	9,103	9,355	27,207	29,019
Treatment [Member] \| Cost Reimbursement [Member]
Net revenues
Treatment [Member] \| Time and Materials [Member]
Net revenues
Services [Member]
Net revenues	2,881	2,403	10,594	8,160
Services [Member] \| Fixed Price [Member]
Net revenues	304	383	1,040	623
Services [Member] \| Cost Reimbursement [Member]
Net revenues
Services [Member] \| Time and Materials [Member]
Net revenues	2,577	2,020	9,554	7,537
Domestic Government [Member]
Net revenues	8,400	8,546	27,329	27,683
Domestic Government [Member] \| Treatment [Member]
Net revenues	6,552	7,170	19,098	21,764
Domestic Government [Member] \| Services [Member]
Net revenues	1,848	1,376	8,231	5,919
Domestic Commercial [Member]
Net revenues	3,155	2,708	9,656	8,672
Domestic Commercial [Member] \| Treatment [Member]
Net revenues	2,437	2,185	7,995	7,255
Domestic Commercial [Member] \| Services [Member]
Net revenues	718	523	1,661	1,417
Foreign Government [Member]
Net revenues	408	483	746	762
Foreign Government [Member] \| Treatment [Member]
Net revenues	114		114
Foreign Government [Member] \| Services [Member]
Net revenues	294	483	632	762
Foreign Commercial [Member]
Net revenues	21	21	70	62
Foreign Commercial [Member] \| Treatment [Member]
Net revenues
Foreign Commercial [Member] \| Services [Member]
Net revenues	$ 21	$ 21	$ 70	$ 62

Quarterly report pursuant to Section 13 or 15(d)

Revenue - Schedule of Disaggregation of Revenue (Details)