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COMMON STOCK WARRANTS - Schedule of Common Stock Warrant Activity (Details) - shares |  | 12 Months Ended
--- | --- | ---
Oct. 08, 2021 | Dec. 31, 2021
Class of Warrant or Right [Roll Forward] |  |
Warrants or rights at beginning of period (in shares) |  | 0
Warrants issued (in shares) |  | 12,416,621
Warrants exercised (in shares) |  | 955,374
Warrants or rights at end of period (in shares) |  | 11,461,247
Earnout Warrants |  |
Class of Warrant or Right [Roll Forward] |  |
Warrants or rights at beginning of period (in shares) |  | 0
Warrants issued (in shares) |  | 583,334
Warrants exercised (in shares) |  | 0
Warrants or rights at end of period (in shares) |  | 583,334
Public Warrants |  |
Class of Warrant or Right [Roll Forward] |  |
Warrants or rights at beginning of period (in shares) |  | 0
Warrants issued (in shares) |  | 8,333,287
Warrants exercised (in shares) |  | 955,374
Warrants or rights at end of period (in shares) |  | 7,377,913
Private Warrants |  |
Class of Warrant or Right [Roll Forward] |  |
Warrants or rights at beginning of period (in shares) |  | 0
Warrants issued (in shares) |  | 3,500,000
Warrants exercised (in shares) |  | 0
Warrants or rights at end of period (in shares) | 4,083,334 | 3,500,000

X
- Definition Class of Warrant Or Right, Exercises In Period + References No definition available. + Details
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Namespace Prefix: | ghw_
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Period Type: | duration

X
- Definition Class of Warrant or Right, Grants In Period + References No definition available. + Details
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X
- Definition Class of Warrant or Right + References No definition available. + Details
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Namespace Prefix: | ghw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |