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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2022
Revenue recognition |
Disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three | ​ | Three
​ | ​ | Months Ended | ​ | Months Ended
​ | ​ | March 31, | ​ | March 31,
(in thousands) |  | 2022 |  | 2021
Charging revenue, retail |  | $ | 3,502 |  | $ | 1,803
Charging revenue, OEM | ​ |  | 151 | ​ |  | 332
Charging revenue, commercial | ​ |  | 709 | ​ |  | 491
Network revenue, OEM | ​ |  | 490 | ​ |  | 532
Ancillary revenue | ​ |  | 1,470 | ​ |  | 403
Regulatory credit sales | ​ |  | 1,378 | ​ |  | 569
Total revenue | ​ | $ | 7,700 | ​ | $ | 4,130
Contract assets and liabilities and liabilities activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
(in thousands) | ​ | 2022 | ​ | 2021
Contract assets | ​ | $ | — | ​ | $ | 32
Contract liabilities | ​ |  | 37,022 | ​ |  | 38,445
​
​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(in thousands) | ​ | 2022
Balance as of December 31, 2021 | ​ | $ | 38,445
Additions | ​ |  | 377
Recognized in revenue | ​ |  | (1,276)
Marketing activities | ​ |  | (524)
Balance as of March 31, 2022 | ​ | $ | 37,022
Schedule of deferred revenue to be recognized | ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2022 | ​ | $ | 1,481
2023 | ​ |  | 1,219
2024 | ​ |  | 687
2025 | ​ |  | 7
​ | ​ | $ | 3,394

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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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