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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Net revenues | $ 17,135 | $ 13,160 | $ 28,843 | $ 25,817
Fixed Price [Member] |  |  |  |
Net revenues | 12,803 | 9,864 | 23,136 | 18,913
Time and Materials [Member] |  |  |  |
Net revenues | 4,332 | 3,296 | 5,707 | 6,904
Treatment [Member] |  |  |  |
Net revenues | 10,094 | 9,146 | 19,999 | 18,105
Treatment [Member] | Fixed Price [Member] |  |  |  |
Net revenues | 10,094 | 9,146 | 19,999 | 18,105
Treatment [Member] | Time and Materials [Member] |  |  |  |
Net revenues |  |  |  |
Services [Member] |  |  |  |
Net revenues | 7,041 | 4,014 | 8,844 | 7,712
Services [Member] | Fixed Price [Member] |  |  |  |
Net revenues | 2,709 | 718 | 3,137 | 808
Services [Member] | Time and Materials [Member] |  |  |  |
Net revenues | 4,332 | 3,296 | 5,707 | 6,904
Domestic Government [Member] |  |  |  |
Net revenues | 11,379 | 9,276 | 19,978 | 18,929
Domestic Government [Member] | Treatment [Member] |  |  |  |
Net revenues | 6,537 | 6,011 | 14,449 | 12,546
Domestic Government [Member] | Services [Member] |  |  |  |
Net revenues | 4,842 | 3,265 | 5,529 | 6,383
Domestic Commercial [Member] |  |  |  |
Net revenues | 4,250 | 3,676 | 6,887 | 6,502
Domestic Commercial [Member] | Treatment [Member] |  |  |  |
Net revenues | 3,395 | 3,135 | 5,274 | 5,559
Domestic Commercial [Member] | Services [Member] |  |  |  |
Net revenues | 855 | 541 | 1,613 | 943
Foreign Government [Member] |  |  |  |
Net revenues | 1,485 | 185 | 1,879 | 338
Foreign Government [Member] | Treatment [Member] |  |  |  |
Net revenues | 162 |  | 220 |
Foreign Government [Member] | Services [Member] |  |  |  |
Net revenues | 1,323 | 185 | 1,659 | 338
Foreign Commercial [Member] |  |  |  |
Net revenues | 21 | 23 | 99 | 48
Foreign Commercial [Member] | Treatment [Member] |  |  |  |
Net revenues |  |  | 56 |
Foreign Commercial [Member] | Services [Member] |  |  |  |
Net revenues | $ 21 | $ 23 | $ 43 | $ 48

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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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