Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
$ 39,927
|
|
$ 69,007
|
|
| Sales of fuel cell systems |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
14,633
|
|
21,207
|
|
| Sale of hydrogen installations and other infrastructure |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
5,989
|
|
10,873
|
|
| Services performed on fuel cell systems and related infrastructure |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
7,188
|
|
13,786
|
|
| Power purchase agreements |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
5,629
|
|
11,118
|
|
| Fuel delivered to customers |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
$ 6,488
|
|
$ 12,023
|
|
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
|
$ 22,604
|
|
$ 37,839
|
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Sales of fuel cell systems |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
|
5,582
|
|
7,400
|
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Sale of hydrogen installations and other infrastructure |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
|
2,978
|
|
3,357
|
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Services performed on fuel cell systems and related infrastructure |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
|
5,049
|
|
10,198
|
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Power purchase agreements |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
|
4,945
|
|
9,256
|
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Fuel delivered to customers |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
|
3,986
|
|
7,477
|
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Other |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total gross revenue |
|
$ 64
|
|
$ 151
|