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REVENUE (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table provides information on the disaggregation of revenue as recorded in the consolidated statements of operations (in thousands):
| Three Months Ended June 30, | Six Months Ended June 30,
| 2021 |  | 2020 | 2021 |  | 2020
Partnership hardware revenue | $ | 14,184 |  | $ | 709 | $ | 24,723 |  | $ | 1,427
Partnership service revenue | 42 |  | — | 79 |  | —
Host customer service revenue | 5,111 |  | 3,670 | 9,956 |  | 7,062
Total revenue | $ | 19,337 |  | $ | 4,379 | $ | 34,758 |  | $ | 8,489
Remaining Performance Obligations | As of June 30, 2021, the Company had $189.8 million of remaining performance obligations, and the approximate percentages expected to be recognized as revenue in the future are as follows (in thousands):
| Total remaining performance obligations |  | Percent Expected to be Recognized as Revenue
|  | Less than one year |  | Two to five years |  | Greater than five year
(in thousands, except percentages)
Service revenue | $ | 130,564 |  |  | 13 | % |  | 50 | % |  | 37 | %
Hardware revenue | 59,238 |  |  | 100 | % |  | — | % |  | — | %
Total revenue | $ | 189,802 |  |  |  |  |  |  |
Contract Balances | The following table presents the changes in the deferred revenue balance during the six months ended June 30, 2021 (in thousands):
Beginning balance as of January 1, 2021 | $ | 52,410 |
Upfront payments received from customers | 25,146 |
Upfront or annual incentive payments received | 2,959 |
Revenue recognized related to amounts that were included in beginning balance of deferred revenue | (19,457) |
Revenue recognized related to deferred revenue generated during the period | (5,354) |
Ending balance as of June 30, 2021 | $ | 55,704 |

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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=123351226&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=123351226&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 + Details
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