XML 85 R68.htm IDEA: XBRL DOCUMENT
v3.22.4

FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Short-Term Investments | $ 105,047 | $ 0
Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total Assets at Fair Value | 139,087 | 238,022
Cash Equivalents and Restricted Cash | 34,040 | 238,022
Short-Term Investments | 105,047 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Earnout warrant liabilities | 163 |
Earnout warrant liabilities |  | 1,476
Liabilities, Fair Value Disclosure, Total | 3,209 | 28,997
Fair Value, Recurring | Public common stock warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Common stock warrants | 2,066 | 18,666
Fair Value, Recurring | Private common stock warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Common stock warrants | 980 | 8,855
Fair Value, Recurring | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total Assets at Fair Value | 47,937 |
Cash Equivalents and Restricted Cash | 27,993 |
Short-Term Investments | 19,944 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Earnout warrant liabilities | 0 |
Earnout warrant liabilities |  | 0
Liabilities, Fair Value Disclosure, Total | 2,066 | 18,666
Fair Value, Recurring | Level 1 | Public common stock warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Common stock warrants | 2,066 | 18,666
Fair Value, Recurring | Level 1 | Private common stock warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Common stock warrants | 0 | 0
Fair Value, Recurring | Level 1 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total Assets at Fair Value | 27,993 | 237,897
Cash Equivalents and Restricted Cash | 27,993 | 237,897
Short-Term Investments | 0 | 0
Fair Value, Recurring | Level 1 | U.S. Treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total Assets at Fair Value | 19,944 |
Cash Equivalents and Restricted Cash | 0 |
Short-Term Investments | 19,944 |
Fair Value, Recurring | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total Assets at Fair Value | 91,150 |
Cash Equivalents and Restricted Cash | 6,047 |
Short-Term Investments | 85,103 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Earnout warrant liabilities | 163 |
Earnout warrant liabilities |  | 1,476
Liabilities, Fair Value Disclosure, Total | 1,143 | 10,331
Fair Value, Recurring | Level 2 | Public common stock warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Common stock warrants | 0 | 0
Fair Value, Recurring | Level 2 | Private common stock warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Common stock warrants | 980 | 8,855
Fair Value, Recurring | Level 2 | Certificate of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total Assets at Fair Value | 75 | 125
Cash Equivalents and Restricted Cash | 75 | 125
Short-Term Investments | 0 | 0
Fair Value, Recurring | Level 2 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total Assets at Fair Value | 55,319 |
Cash Equivalents and Restricted Cash | 0 |
Short-Term Investments | 55,319 |
Fair Value, Recurring | Level 2 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total Assets at Fair Value | 35,756 |
Cash Equivalents and Restricted Cash | 5,972 |
Short-Term Investments | 29,784 |
Fair Value, Recurring | Level 3 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Earnout warrant liabilities | 0 |
Earnout warrant liabilities |  | 0
Liabilities, Fair Value Disclosure, Total | 0 | 0
Fair Value, Recurring | Level 3 | Public common stock warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Common stock warrants | 0 | 0
Fair Value, Recurring | Level 3 | Private common stock warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Common stock warrants | $ 0 | $ 0

X
- Definition Common Stock Warrants, Fair Value Disclosure + References No definition available. + Details
Name: | ghw_CommonStockWarrantsFairValueDisclosure
Namespace Prefix: | ghw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Earnout Warrant Liabilities, Fair Value Disclosure + References No definition available. + Details
Name: | ghw_EarnoutWarrantLiabilitiesFairValueDisclosure
Namespace Prefix: | ghw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Warrant Liabilities, Fair Value Disclosure + References No definition available. + Details
Name: | ghw_WarrantLiabilitiesFairValueDisclosure
Namespace Prefix: | ghw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_TradingSecuritiesDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ghw_PublicWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ghw_PrivateWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |