| Line | Roll Up Total Concept | Roll Up Items Concept | Count |
|---|---|---|---|
| 1 | fcel:CommercialCustomersAccountsReceivable | us-gaap:UnbilledContractsReceivable | 1 |
| 2 | fcel:CommercialCustomersAccountsReceivable | us-gaap:AccountsReceivableBilledForLongTermContractsOrPrograms | 1 |
(Note that this is a work in progress!)