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Revenue | 6 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Revenue | 3. Revenue Disaggregation of Revenue In general, the Company’s business segmentation is aligned according to the nature and economic characteristics of our services and provides meaningful disaggregation of each business segment’s results of operations. The nature of the Company’s performance obligations within our Treatment and Services Segments result in the recognition of our revenue primarily over time. The following tables present further disaggregation of our revenues by different categories for our Services and Treatment Segments: Schedule of Disaggregation of Revenue
Revenue by Contract Type |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(In thousands) |  | Three Months Ended |  |  | Three Months Ended |
|  | June 30, 2021 |  |  | June 30, 2020 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 7,706 |  |  | $ | 1,482 |  |  | $ | 9,188 |  |  | $ | 7,840 |  |  | $ | 2,329 |  |  | $ | 10,169 |
Time and materials |  |  | — |  |  |  | 6,957 |  |  |  | 6,957 |  |  |  | — |  |  |  | 11,878 |  |  |  | 11,878 |
Total |  | $ | 7,706 |  |  | $ | 8,439 |  |  | $ | 16,145 |  |  | $ | 7,840 |  |  | $ | 14,207 |  |  | $ | 22,047 |
Revenue by Contract Type |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(In thousands) |  | Six Months Ended |  |  |  |  |  | Six Months Ended |  |  |  |
|  | June 30, 2021 |  |  |  |  |  | June 30, 2020 |  |  |  |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Fixed price |  | $ | 15,201 |  |  | $ | 4,063 |  |  | $ | 19,264 |  |  | $ | 17,403 |  |  | $ | 3,721 |  |  | $ | 21,124 |
Time and materials |  |  | — |  |  |  | 20,014 |  |  |  | 20,014 |  |  |  | — |  |  |  | 25,783 |  |  |  | 25,783 |
Total |  | $ | 15,201 |  |  | $ | 24,077 |  |  | $ | 39,278 |  |  | $ | 17,403 |  |  | $ | 29,504 |  |  | $ | 46,907 |
Revenue by generator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(In thousands) |  | Three Months Ended |  |  |  |  |  | Three Months Ended |  |  |  |
|  | June 30, 2021 |  |  |  |  |  | June 30, 2020 |  |  |  |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 5,639 |  |  | $ | 6,764 |  |  | $ | 12,403 |  |  | $ | 6,055 |  |  | $ | 12,791 |  |  | $ | 18,846 |
Domestic commercial |  |  | 2,060 |  |  |  | 391 |  |  |  | 2,451 |  |  |  | 1,785 |  |  |  | 431 |  |  |  | 2,216 |
Foreign government |  |  | 7 |  |  |  | 1,261 |  |  |  | 1,268 |  |  |  | — |  |  |  | 965 |  |  |  | 965 |
Foreign commercial |  |  | — |  |  |  | 23 |  |  |  | 23 |  |  |  | — |  |  |  | 20 |  |  |  | 20 |
Total |  | $ | 7,706 |  |  | $ | 8,439 |  |  | $ | 16,145 |  |  | $ | 7,840 |  |  | $ | 14,207 |  |  | $ | 22,047 |
Revenue by generator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(In thousands) |  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, 2021 |  |  | June 30, 2020 |
|  | Treatment |  |  | Services |  |  | Total |  |  | Treatment |  |  | Services |  |  | Total |
Domestic government |  | $ | 10,237 |  |  | $ | 19,425 |  |  | $ | 29,662 |  |  | $ | 13,745 |  |  | $ | 26,589 |  |  | $ | 40,334 |
Domestic commercial |  |  | 4,328 |  |  |  | 981 |  |  |  | 5,309 |  |  |  | 3,658 |  |  |  | 893 |  |  |  | 4,551 |
Foreign government |  |  | 541 |  |  |  | 3,625 |  |  |  | 4,166 |  |  |  | — |  |  |  | 1,979 |  |  |  | 1,979 |
Foreign commercial |  |  | 95 |  |  |  | 46 |  |  |  | 141 |  |  |  | — |  |  |  | 43 |  |  |  | 43 |
Total |  | $ | 15,201 |  |  | $ | 24,077 |  |  | $ | 39,278 |  |  | $ | 17,403 |  |  | $ | 29,504 |  |  | $ | 46,907 |
Contract Balances The timing of revenue recognition, billings, and cash collections results in accounts receivable and unbilled receivables (contract assets). The Company’s contract liabilities consist of deferred revenues which represents advance payment from customers in advance of the completion of our performance obligation. The following table represents changes in our contract assets and contract liabilities balances: Schedule of Contract Assets and Liabilities
|  | June 30, |  |  | December 31, |  |  | Year-to-date |  |  | Year-to-date |
(In thousands) |  | 2021 |  |  | 2020 |  |  | Change ($) |  |  | Change (%) |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Account receivables, net of allowance |  | $ | 9,244 |  |  | $ | 9,659 |  |  | $ | (415 | ) |  |  | (4.3 | )%
Unbilled receivables - current |  |  | 7,332 |  |  |  | 14,453 |  |  |  | (7,121 | ) |  |  | (49.3 | )%
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 3,932 |  |  | $ | 4,614 |  |  | $ | (682 | ) |  |  | (14.8 | )%
During the three and six months ended June 30, 2021, the Company recognized revenue of $1,763,000 and $6,074,000, respectively, related to untreated waste that was in the Company’s control as of the beginning of each respective year. During the three and six months ended June 30, 2020, the Company recognized revenue of $2,516,000 and $6,539,000, respectively, related to untreated waste that was in the Company’s control as of the beginning of each respective year. Revenue recognized in each period related to performance obligations satisfied within the respective period. Remaining Performance Obligations The Company applies the practical expedient in ASC 606-10-50-14 and does not disclose information about remaining performance obligations that have original expected durations of one year or less. Within our Services Segment, there are service contracts which provide that the Company has a right to consideration from a customer in an amount that corresponds directly with the value to the customer of our performance completed to date. For those contracts, the Company has utilized the practical expedient in ASC 606-10-55-18, which allows the Company to recognize revenue in the amount for which we have the right to invoice; accordingly, the Company does not disclose the value of remaining performance obligations for those contracts.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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