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Acquisitions - Narratives (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 22, 2020 USD ($) item | Jun. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 18, 2020
Earn-out payments |  |  |  | $ 1,100 | $ 1,100 |
Deferred tax liability |  |  |  | 6,100 | 6,100 |
Reduction to valuation allowance |  |  |  |  | 5,200 |
Unrecognized tax benefits released due to expiration of stature of limitations |  |  |  | 5,200 | 5,200 |
Income tax benefit |  |  |  | 17,659 | 17,659 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  |  | 6,100 | 6,100 |
Business Combination, Contingent Consideration, Liability |  |  |  | 1,100 | 1,100 |
Income Tax Expense (Benefit) |  |  |  | (17,659) | (17,659) |
Forecast |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  | $ 1,500 |  |  |  |
Giner ELX, Inc |  |  |  |  |  |
Percentage of outstanding shares | 100.00% |  |  |  |  |
Earn-out payments | $ 16,000 |  |  |  |  |
Achievement of Allagah earn out | 8,000 |  |  |  |  |
Receipt of certain customer opportunities | 2,000 |  |  |  |  |
Achievement of revenue targets | $ 6,000 |  |  |  |  |
Number of electrolyzer stacks | item | 2 |  |  |  |  |
Warrants term | 2 years |  |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 16,000 |  |  |  |  |
Giner ELX, Inc | Non achieving of allagash earn out revenue by July 31, 2033 |  |  |  |  |  |
Percentage of monthly reduction of contingent consideration | 8.33% |  |  |  |  |
Giner ELX, Inc | Earn-out revenue exceeds 150% of target stated for year 2023 |  |  |  |  |  |
Warrants | $ 5,000 |  |  |  |  |
Giner ELX, Inc | Earn-out revenue exceeds 200% of target stated for year 2023 |  |  |  |  |  |
Warrants | $ 10,000 |  |  |  |  |
United Hydrogen Group Inc |  |  |  |  |  |
Cash paid in respect to certain indebtedness |  |  | $ 1,300 |  |  |
Percentage of outstanding shares |  |  |  |  |  | 100.00%
United Hydrogen Group Inc | Common Stock |  |  |  |  |  |
Value of shares of common stock issued |  |  | $ 6,500 |  |  |
Developed Technology Rights |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  | 2,300 | 2,300 |
In process R&D |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  | 29,000 | 29,000 |
Customer relationships |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  | $ 300 | $ 300 |

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