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Restatement of Previously Issued Financial Statements - Statement of Cash Flows (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 20, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Net loss |  |  |  | $ (156,124,000) | $ (59,414,000)
Net cash used in operating activities |  | $ (1,827,000) | $ (10,670,000) | (33,671,000) | (29,678,000)
Net cash used in investing activities |  | (2,763,000) | (3,310,000) | (12,036,000) | (46,358,000)
Net cash provided by financing activities |  | 7,093,000 | 12,155,000 | 40,294,000 | 67,201,000
Net decrease in cash and cash equivalents |  | 2,931,000 | (2,009,000) | (5,947,000) | (9,005,000)
Star Peak Energy Transition Corp [Member] |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Net loss |  | (156,346,958) | (1,100) | (112,633,298) | (10,406)
Adjustments to reconcile net loss to net cash used in operating activities |  |  |  | 109,269,830 |
Net cash used in operating activities |  | (510,709) | 0 | (1,838,477) | (17,473)
Net cash used in investing activities |  |  |  | (383,585,040) |
Net cash provided by financing activities |  |  |  | 386,360,290 | (142,199)
Net decrease in cash and cash equivalents |  | $ (510,709) | $ 0 | 936,773 | $ (159,672)
Increase to warrant liabilities due to the impact of accounting for Public and private warrants | $ 11,800,000 |  |  |  |
Star Peak Energy Transition Corp [Member] | Restatement of warrants as derivative liabilities | As Previously Reported |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Net loss |  |  |  | (3,363,468) |
Net cash used in operating activities |  |  |  | (1,838,477) |
Net cash used in investing activities |  |  |  | (383,585,040) |
Net cash provided by financing activities |  |  |  | 386,360,290 |
Net decrease in cash and cash equivalents |  |  |  | 936,773 |
Star Peak Energy Transition Corp [Member] | Restatement of warrants as derivative liabilities | Restatement Adjustment |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Net loss |  |  |  | (109,269,830) |
Adjustments to reconcile net loss to net cash used in operating activities |  |  |  | $ 109,269,830 |

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