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Revenue Recognition | 9 Months Ended
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Sep. 30, 2020
Revenue from Contract with Customer [Abstract] |
Revenue Recognition | Revenue Recognition Disaggregated Revenues The table below presents revenue disaggregated by source, for the three and nine months ended September 30, 2020 and 2019 (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
LNG Product | $ | 6,594 |  |  | $ | 7,919 |  |  | $ | 18,609 |  |  | $ | 26,872 |
Rental | 737 |  |  | 759 |  |  | 4,012 |  |  | 4,340 |
Service | 187 |  |  | 7 |  |  | 593 |  |  | 689 |
Power Delivery | 1,352 |  |  | 1,371 |  |  | 3,638 |  |  | 1,371 |
Other | 149 |  |  | 458 |  |  | 1,008 |  |  | 1,312 |
| $ | 9,019 |  |  | $ | 10,514 |  |  | $ | 27,860 |  |  | $ | 34,584 |
See Note 5—Business Segments, below, for additional disaggregation of revenue. Contract Liabilities The Company recognizes contract liabilities upon receipt of payments for which the performance obligations have not been fulfilled at the reporting date, resulting in deferred revenue. Contract liabilities are included in accrued liabilities in the accompanying unaudited condensed consolidated balance sheets. The following table presents the changes in the Company’s contract liabilities for the periods ended September 30, 2020 and December 31, 2019 (in thousands):
|  |  |  |  | September 30, 2020 |  | December 31, 2019
Balance at beginning of period |  |  |  |  | $ | 185 |  |  | $ | 93 |
Cash received, excluding amounts recognized as revenue |  |  |  |  | 694 |  |  | 185 |
Amounts recognized as revenue |  |  |  |  | (477) |  |  | (93) |
Balance at end of period |  |  |  |  | $ | 402 |  |  | $ | 185 |
The Company has no other material contract assets or liabilities and contract costs.

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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=121604090&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=121604090&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=121604090&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=121604090&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=121604090&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=121604090&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=121604090&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=121604090&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=121604090&loc=SL49130554-203045 + Details
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