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Revenue Recognition | 3 Months Ended
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Mar. 31, 2022
Revenue recognition |
Revenue Recognition | Note 4 – 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
​ The following table provides information about contract assets and liabilities from contracts with customers: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
(in thousands) | ​ | 2022 | ​ | 2021
Contract assets | ​ | $ | — | ​ | $ | 32
Contract liabilities | ​ |  | 37,022 | ​ |  | 38,445
​ The following table provides the activity for contract liabilities during the period presented: ​
​ | ​ | ​ | ​
​ | ​ | 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
​ It is anticipated that deferred revenue as of March 31, 2022 will be recognized for the years ending December 31, as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2022 | ​ | $ | 1,481
2023 | ​ |  | 1,219
2024 | ​ |  | 687
2025 | ​ |  | 7
​ | ​ | $ | 3,394
​ ASC 606 does not require disclosure of the transaction price to remaining performance obligations if the contract contains variable consideration allocated entirely to a wholly unsatisfied performance obligation. Under many customer contracts, each unit of product represents a separate performance obligation and therefore future volumes are wholly unsatisfied and disclosure of the transaction price allocated to wholly unsatisfied performance obligations is not required. Under these contracts, variability arises as both volume and pricing are not known until the product is delivered. As of March 31, 2022 and December 31, 2021, there was $22.9 million in variable consideration for wholly unsatisfied performance obligations, which is included in deferred revenue on the condensed consolidated balance sheets.

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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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