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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

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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