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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2020
Revenue |
Schedule of disaggregation of revenue | The following table provides information about disaggregation of revenue (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Major products/services lines | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30,
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
Sales of fuel cell systems | ​ | $ | 41,264 | ​ | $ | 38,696 | ​ | $ | 55,915 | ​ | $ | 41,240
Sale of hydrogen installations and other infrastructure | ​ | ​ | 6,482 | ​ | ​ | — | ​ | ​ | 12,218 | ​ | ​ | —
Services performed on fuel cell systems and related infrastructure | ​ | ​ | 6,236 | ​ | ​ | 5,341 | ​ | ​ | 12,757 | ​ | ​ | 11,684
Power Purchase Agreements | ​ | ​ | 6,654 | ​ | ​ | 6,409 | ​ | ​ | 13,150 | ​ | ​ | 12,519
Fuel delivered to customers | ​ | ​ | 7,372 | ​ | ​ | 7,089 | ​ | ​ | 14,705 | ​ | ​ | 13,671
Other | ​ | ​ | 62 | ​ | ​ | — | ​ | ​ | 138 | ​ | ​ | —
Net revenue | ​ | $ | 68,070 | ​ | $ | 57,535 | ​ | $ | 108,883 | ​ | $ | 79,114
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of receivables, contract assets and contract liabilities from contracts with customers | The following table provides information about receivables, contract assets and contract liabilities from contracts with customers (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ | ​ | 2020 | ​ | 2019
Accounts receivable | ​ | $ | 45,522 | ​ | $ | 25,448
Contract assets | ​ | ​ | 20,481 | ​ | ​ | 13,251
Contract liabilities | ​ | ​ | 50,233 | ​ | ​ | 43,480
Schedule of changes in contract assets and the contract liabilities | Significant changes in the contract assets and the contract liabilities balances during the period are as follows (in thousands):
​ | ​ | ​ | ​
​ | ​ | ​ | ​
Contract assets | ​ | Six months ended
​ | ​ | June 30, 2020
Transferred to receivables from contract assets recognized at the beginning of the period | ​ | $ | (9,671)
Revenue recognized and not billed as of the end of the period | ​ | ​ | 16,901
Net change in contract assets | ​ | ​ | 7,230
​
​ | ​ | ​ | ​
​
Contract liabilities | ​ | Six months ended
​ | ​ | June 30, 2020
Increases due to cash received, net of amounts recognized as revenue during the period | ​ | $ | 24,835
Revenue recognized that was included in the contract liability balance as of the beginning of the period | ​ | ​ | (18,082)
Net change in contract liabilities | ​ | $ | 6,753
Schedule of Estimated future revenue | The following table includes estimated revenue expected to be recognized in the future (sales of fuel cell systems and hydrogen installations are expected to be recognized as revenue within one year; sales of services and PPAs are expected to be recognized as revenue over five to seven years) related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period, excluding provision for common stock warrants as it is not readily estimable as it depends on the valuation of the common stock warrants when revenue is recognized (in thousands):
​ | ​ | ​ | ​
​ | ​ | ​ | ​
​ | ​ | June 30,
​ | ​ | 2020
Sales of fuel cell systems | ​ | $ | 71,402
Sale of hydrogen installations and other infrastructure | ​ | ​ | 71,753
Services performed on fuel cell systems and related infrastructure | ​ | ​ | 94,725
Power Purchase Agreements | ​ | ​ | 151,793
Other rental income | ​ | ​ | 4,117
Total estimated future revenue | ​ | $ | 393,790

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