Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands |
3 Months Ended |
12 Months Ended |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
$ 59,820
|
$ 53,165
|
$ 35,229
|
$ 26,418
|
$ 31,095
|
$ 34,593
|
$ 20,007
|
$ 14,458
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
$ 174,632
|
$ 100,153
|
$ 82,819
|
| Sales of fuel cell systems |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
75,146
|
|
|
| Sale of hydrogen installations and other infrastructure |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
32,146
|
|
|
| Services performed on fuel cell systems and related infrastructure |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
5,672
|
5,156
|
5,691
|
5,483
|
5,706
|
2,217
|
3,908
|
4,372
|
22,002
|
16,202
|
17,347
|
| Power Purchase Agreements |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
6,504
|
5,555
|
5,438
|
5,372
|
5,276
|
(1,663)
|
4,945
|
4,311
|
22,869
|
12,869
|
13,687
|
| Fuel delivered to customers |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
$ 6,453
|
$ 5,786
|
$ 5,280
|
$ 4,950
|
5,384
|
(4,149)
|
3,440
|
3,491
|
$ 22,469
|
8,167
|
10,916
|
| Other |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
$ 5
|
$ 128
|
$ 64
|
$ 87
|
|
284
|
$ 884
|
| Calculated under Revenue Guidance in Effect before Topic 606 |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
|
100,153
|
|
| Calculated under Revenue Guidance in Effect before Topic 606 | Sales of fuel cell systems |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
|
49,179
|
|
| Calculated under Revenue Guidance in Effect before Topic 606 | Sale of hydrogen installations and other infrastructure |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
|
13,452
|
|
| Calculated under Revenue Guidance in Effect before Topic 606 | Services performed on fuel cell systems and related infrastructure |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
|
16,202
|
|
| Calculated under Revenue Guidance in Effect before Topic 606 | Power Purchase Agreements |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
|
12,869
|
|
| Calculated under Revenue Guidance in Effect before Topic 606 | Fuel delivered to customers |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
|
8,167
|
|
| Calculated under Revenue Guidance in Effect before Topic 606 | Other |
|
|
|
|
|
|
|
|
|
|
|
| Revenue |
|
|
|
|
|
|
|
|
|
|
|
| Net revenue |
|
|
|
|
|
|
|
|
|
$ 284
|
|