Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net revenues	$ 11,708	$ 12,658
Fixed Price [Member]
Net revenues	10,333	9,049
Time and Materials [Member]
Net revenues	1,375	3,609
Treatment [Member]
Net revenues	9,905	8,959
Treatment [Member] \| Fixed Price [Member]
Net revenues	9,905	8,959
Treatment [Member] \| Time and Materials [Member]
Net revenues
Services [Member]
Net revenues	1,803	3,699
Services [Member] \| Fixed Price [Member]
Net revenues	428	90
Services [Member] \| Time and Materials [Member]
Net revenues	1,375	3,609
Domestic Government [Member]
Net revenues	8,599	9,654
Domestic Government [Member] \| Treatment [Member]
Net revenues	7,913	6,536
Domestic Government [Member] \| Services [Member]
Net revenues	686	3,118
Domestic Commercial [Member]
Net revenues	2,637	2,825
Domestic Commercial [Member] \| Treatment [Member]
Net revenues	1,879	2,423
Domestic Commercial [Member] \| Services [Member]
Net revenues	758	402
Foreign Government [Member]
Net revenues	394	153
Foreign Government [Member] \| Treatment [Member]
Net revenues	57
Foreign Government [Member] \| Services [Member]
Net revenues	337	153
Foreign Commercial [Member]
Net revenues	78	26
Foreign Commercial [Member] \| Treatment [Member]
Net revenues	56
Foreign Commercial [Member] \| Services [Member]
Net revenues	$ 22	$ 26