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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2019
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables present further disaggregation of our revenues by different categories for our Services and Treatment Segments: Revenue by Contract Type
(In thousands) |  | Three Months Ended |  |  | Three Months Ended |
|  | September 30, 2019 |  |  | September 30, 2018 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 10,081 |  |  | $ | 5,364 |  |  | $ | 15,445 |  |  | $ | 9,103 |  |  | $ | 304 |  |  | $ | 9,407 |
Time and materials |  |  | ― |  |  |  | 7,090 |  |  |  | 7,090 |  |  |  | ― |  |  |  | 2,577 |  |  |  | 2,577 |
Total |  | $ | 10,081 |  |  | $ | 12,454 |  |  | $ | 22,535 |  |  | $ | 9,103 |  |  | $ | 2,881 |  |  | $ | 11,984 |
Revenue by Contract Type
(In thousands) |  | Nine Months Ended |  |  | Nine Months Ended |
|  | September 30, 2019 |  |  | September 30, 2018 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 30,079 |  |  | $ | 9,231 |  |  | $ | 39,310 |  |  | $ | 27,207 |  |  | $ | 1,040 |  |  | $ | 28,247 |
Time and materials |  |  | ― |  |  |  | 12,068 |  |  |  | 12,068 |  |  |  | ― |  |  |  | 9,554 |  |  |  | 9,554 |
Total |  | $ | 30,079 |  |  | $ | 21,299 |  |  | $ | 51,378 |  |  | $ | 27,207 |  |  | $ | 10,594 |  |  | $ | 37,801 |
Revenue by generator
(In thousands) |  | Three Months Ended |  |  | Three Months Ended |
|  | September 30, 2019 |  |  | September 30, 2018 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 7,537 |  |  | $ | 10,155 |  |  | $ | 17,692 |  |  | $ | 6,552 |  |  | $ | 1,848 |  |  | $ | 8,400 |
Domestic commercial |  |  | 2,535 |  |  |  | 475 |  |  |  | 3,010 |  |  |  | 2,437 |  |  |  | 718 |  |  |  | 3,155 |
Foreign government |  |  | ― |  |  |  | 1,804 |  |  |  | 1,804 |  |  |  | 114 |  |  |  | 294 |  |  |  | 408 |
Foreign commercial |  |  | 9 |  |  |  | 20 |  |  |  | 29 |  |  |  | ― |  |  |  | 21 |  |  |  | 21 |
Total |  | $ | 10,081 |  |  | $ | 12,454 |  |  | $ | 22,535 |  |  | $ | 9,103 |  |  | $ | 2,881 |  |  | $ | 11,984 |
Revenue by generator
(In thousands) |  | Nine Months Ended |  |  | Nine Months Ended |
|  | September 30, 2019 |  |  | September 30, 2018 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 21,986 |  |  | $ | 15,683 |  |  | $ | 37,669 |  |  | $ | 19,098 |  |  | $ | 8,231 |  |  | $ | 27,329 |
Domestic commercial |  |  | 7,809 |  |  |  | 2,088 |  |  |  | 9,897 |  |  |  | 7,995 |  |  |  | 1,661 |  |  |  | 9,656 |
Foreign government |  |  | 220 |  |  |  | 3,465 |  |  |  | 3,685 |  |  |  | 114 |  |  |  | 632 |  |  |  | 746 |
Foreign commercial |  |  | 64 |  |  |  | 63 |  |  |  | 127 |  |  |  | ― |  |  |  | 70 |  |  |  | 70 |
Total |  | $ | 30,079 |  |  | $ | 21,299 |  |  | $ | 51,378 |  |  | $ | 27,207 |  |  | $ | 10,594 |  |  | $ | 37,801 |
Schedule of Contract Assets and Liabilities | The following table represents changes in our contract assets and contract liabilities balances:
|  |  |  |  |  |  |  | Year-to-date |  |  | Year-to-date |
(In thousands) |  | September 30, 2019 |  |  | December 31, 2018 |  |  | Change ($) |  |  | Change (%) |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Account receivables, net of allowance |  | $ | 10,781 |  |  | $ | 7,735 |  |  | $ | 3,046 |  |  |  | 39.4 | %
Unbilled receivables - current |  |  | 9,245 |  |  |  | 3,105 |  |  |  | 6,140 |  |  |  | 197.7 | %
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 6,239 |  |  | $ | 6,595 |  |  | $ | (356 | ) |  |  | (5.4 | )%

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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