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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 2020 |  |  | September 30, 2019 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 7,066 |  |  | $ | 10,303 |  |  | $ | 17,369 |  |  | $ | 10,081 |  |  | $ | 5,364 |  |  | $ | 15,445 |
Time and materials |  |  | — |  |  |  | 12,803 |  |  |  | 12,803 |  |  |  | — |  |  |  | 7,090 |  |  |  | 7,090 |
Total |  | $ | 7,066 |  |  | $ | 23,106 |  |  | $ | 30,172 |  |  | $ | 10,081 |  |  | $ | 12,454 |  |  | $ | 22,535 |
Revenue by Contract Type |  | Nine Months Ended |  |  | Nine Months Ended |
(In thousands) |  | September 30, 2020 |  |  | September 30, 2019 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 24,469 |  |  | $ | 19,001 |  |  | $ | 43,470 |  |  | $ | 30,079 |  |  | $ | 9,231 |  |  | $ | 39,310 |
Time and materials |  |  | — |  |  |  | 33,609 |  |  |  | 33,609 |  |  |  | — |  |  |  | 12,068 |  |  |  | 12,068 |
Total |  | $ | 24,469 |  |  | $ | 52,610 |  |  | $ | 77,079 |  |  | $ | 30,079 |  |  | $ | 21,299 |  |  | $ | 51,378 |
Revenue by generator |  | Three Months Ended |  |  | Three Months Ended |
(In thousands) |  | September 30, 2020 |  |  | September 30, 2019 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 5,334 |  |  | $ | 21,660 |  |  | $ | 26,994 |  |  | $ | 7,537 |  |  | $ | 10,155 |  |  | $ | 17,692 |
Domestic commercial |  |  | 1,598 |  |  |  | 459 |  |  |  | 2,057 |  |  |  | 2,535 |  |  |  | 475 |  |  |  | 3,010 |
Foreign government |  |  | 134 |  |  |  | 966 |  |  |  | 1,100 |  |  |  | — |  |  |  | 1,804 |  |  |  | 1,804 |
Foreign commercial |  |  | — |  |  |  | 21 |  |  |  | 21 |  |  |  | 9 |  |  |  | 20 |  |  |  | 29 |
Total |  | $ | 7,066 |  |  | $ | 23,106 |  |  | $ | 30,172 |  |  | $ | 10,081 |  |  | $ | 12,454 |  |  | $ | 22,535 |
Revenue by generator |  | Nine Months Ended |  |  | Nine Months Ended |
(In thousands) |  | September 30, 2020 |  |  | September 30, 2019 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 19,079 |  |  | $ | 48,249 |  |  | $ | 67,328 |  |  | $ | 21,986 |  |  | $ | 15,683 |  |  | $ | 37,669 |
Domestic commercial |  |  | 5,256 |  |  |  | 1,352 |  |  |  | 6,608 |  |  |  | 7,809 |  |  |  | 2,088 |  |  |  | 9,897 |
Foreign government |  |  | 134 |  |  |  | 2,945 |  |  |  | 3,079 |  |  |  | 220 |  |  |  | 3,465 |  |  |  | 3,685 |
Foreign commercial |  |  | — |  |  |  | 64 |  |  |  | 64 |  |  |  | 64 |  |  |  | 63 |  |  |  | 127 |
Total |  | $ | 24,469 |  |  | $ | 52,610 |  |  | $ | 77,079 |  |  | $ | 30,079 |  |  | $ | 21,299 |  |  | $ | 51,378 |
Schedule of Contract Assets and Liabilities | The following table represents changes in our contract assets and contract liabilities balances:
(In thousands) |  | September 30, 2020 |  |  | December 31, 2019 |  |  | Year-to-date Change ($) |  |  | Year-to-date Change (%) |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Account receivables, net of allowance |  | $ | 13,442 |  |  | $ | 13,178 |  |  | $ | 264 |  |  |  | 2.0 | %
Unbilled receivables - current |  |  | 14,366 |  |  |  | 7,984 |  |  |  | 6,382 |  |  |  | 79.9 | %
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 4,806 |  |  | $ | 5,456 |  |  | $ | (650 | ) |  |  | (11.9 | )%

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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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=121604090&loc=SL49130545-203045 + Details
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