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Restatement of Previously Issued Consolidated Financial Statements - Research and development expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Research and Development Expense |  | $ 7,386 | $ 4,873 | $ 4,774 | $ 4,882 | $ 3,563 | $ 3,608 | $ 3,006 | $ 9,647 | $ 6,614 | $ 17,033 | $ 10,177 | $ 27,848 | $ 15,059 | $ 12,750
Gross Profit | $ (431,114) | (28,584) | (15) | (9,703) | 7,746 | 4,500 | 6,142 | (7,740) | (9,718) | (1,598) | (38,302) | 2,902 | $ (469,416) | 10,648 | (26,004)
Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,492 | 21,157
Research and Development Expense |  | (4,578) | (4,884) | (5,638) | (4,459) | (4,465) | (5,325) | (4,367) | (10,522) | (9,692) | (15,100) | (14,157) |  | (18,616) | (21,157)
Gross Profit |  | $ (27,294) | $ (5,091) | $ (5,232) | $ (5,036) | $ (3,847) | $ (4,479) | $ (3,956) | $ (10,323) | $ (8,435) | $ (37,617) | $ (12,282) |  | (17,318) | (28,626)
Restatement Adjustments | Sales of fuel cell systems and related infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,121 | 614
Restatement Adjustments | Services performed on fuel cell systems and related infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,986 | 7,954
Restatement Adjustments | Power Purchase Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,539 | 4,264
Revision of Research and Development Expense | Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (19,492) | $ (21,157)

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