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REVENUE - Schedule of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Roll Forward]
Deferred revenue at beginning of period	$ 3,663	$ 2,258
Deferral of revenue	7,704	1,405
Recognition of previously unearned revenue	(830)	0
Deposits returned to customers	(1,157)	0
Reclassification to accrued liabilities due to estimation of variable consideration	(770)	0
Deferred revenue at end of period	$ 8,610	$ 3,663

X

- Definition

Contract With Customer, Liability, Change In Estimate Of Variable Consideration

+ References

No definition available.

+ Details

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Namespace Prefix:	ghw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Deferral Of Revenue

+ References

No definition available.

+ Details

Name:	ghw_ContractWithCustomerLiabilityDeferralOfRevenue
Namespace Prefix:	ghw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Deposits Returned To Customers

+ References

No definition available.

+ Details

Name:	ghw_ContractWithCustomerLiabilityDepositsReturnedToCustomers
Namespace Prefix:	ghw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract With Customer, Liability

+ References

No definition available.

+ Details

Name:	ghw_ContractWithCustomerLiabilityRollForward
Namespace Prefix:	ghw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

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Balance Type:	credit
Period Type:	duration