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Revenue (Tables) | 12 Months Ended
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Dec. 31, 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) |  | Twelve Months Ended |  |  | Tweleve Months Ended |
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 30,143 |  |  | $ | 8,970 |  |  | $ | 39,113 |  |  | $ | 40,364 |  |  | $ | 12,162 |  |  | $ | 52,526 |
Time and materials |  |  | — |  |  |  | 66,313 |  |  |  | 66,313 |  |  |  | — |  |  |  | 20,788 |  |  |  | 20,788 |
Cost reimbursement |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 145 |  |  |  | 145 |
Total |  | $ | 30,143 |  |  | $ | 75,283 |  |  | $ | 105,426 |  |  | $ | 40,364 |  |  | $ | 33,095 |  |  | $ | 73,459 |
Revenue by generator
(In thousands) |  | Twelve Months Ended |  |  | Twelve Months Ended |
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 22,795 |  |  | $ | 68,237 |  |  | $ | 91,032 |  |  | $ | 29,420 |  |  | $ | 25,077 |  |  | $ | 54,497 |
Domestic commercial |  |  | 6,933 |  |  |  | 1,825 |  |  |  | 8,758 |  |  |  | 10,601 |  |  |  | 2,724 |  |  |  | 13,325 |
Foreign government |  |  | 415 |  |  |  | 5,135 |  |  |  | 5,550 |  |  |  | 279 |  |  |  | 5,209 |  |  |  | 5,488 |
Foreign commercial |  |  | — |  |  |  | 86 |  |  |  | 86 |  |  |  | 64 |  |  |  | 85 |  |  |  | 149 |
Total |  | $ | 30,143 |  |  | $ | 75,283 |  |  | $ | 105,426 |  |  | $ | 40,364 |  |  | $ | 33,095 |  |  | $ | 73,459 |
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) |  | December 31, 2020 |  |  | December 31, 2019 |  |  | Change ($) |  |  | Change (%) |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Account receivables, net of allowance |  | $ | 9,659 |  |  | $ | 13,178 |  |  | $ | (3,519 | ) |  |  | (26.7 | )%
Unbilled receivables - current |  |  | 14,453 |  |  |  | 7,984 |  |  |  | 6,469 |  |  |  | 81.0 | %
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 4,614 |  |  | $ | 5,456 |  |  | $ | (842 | ) |  |  | (15.4 | )%

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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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