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Intangible Assets - Gross Carrying Amount (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | May 31, 2019
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |
Gross Carrying Amount | $ 42,002 |  | $ 8,564 |
Accumulated Amortization | (3,428) |  | (3,025) |
Total | 38,574 |  | 5,539 |
Payments to Acquire Intangible Assets |  | $ 1,860 |  |
Payables for acquiring Intellectual Property | 23,320 |  | $ 14,213 |
EnergyOr |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |
Acquired |  | $ 1,500 |  |
Milestone payments |  |  |  | $ 3,000
American Fuel Cell LLC |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |
Milestone payments | 2,900 |  |  |
Payments to Acquire Intangible Assets | 400 |  |  |
Payables for acquiring Intellectual Property | 1,700 |  |  |
In process R&D |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |
Gross Carrying Amount | 29,000 |  |  |
Total | $ 29,000 |  |  |
Acquired technology |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |
Weighted Average Amortization Period | 10 years |  | 9 years |
Gross Carrying Amount | $ 12,112 |  | $ 8,244 |
Accumulated Amortization | (3,205) |  | (2,815) |
Total | $ 8,907 |  | $ 5,429 |
Customer relationships, Backlog & Trademark |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |
Weighted Average Amortization Period | 8 years |  |  |
Gross Carrying Amount | $ 890 |  |  |
Accumulated Amortization | (223) |  |  |
Total | $ 667 |  |  |
Customer Relationships And Trademark [Member] |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |
Weighted Average Amortization Period |  |  | 9 years |
Gross Carrying Amount |  |  | $ 320 |
Accumulated Amortization |  |  | (210) |
Total |  |  | $ 110 |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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