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REVENUE RECOGNITION - Narrative (Details)	12 Months Ended
	Dec. 31, 2021
Minimum
Disaggregation of Revenue [Line Items]
Interest rate	8.00%
Repayment term	12 months
Maximum
Disaggregation of Revenue [Line Items]
Interest rate	12.00%
Repayment term	18 months

X

- Definition

Trade Receivable, Payment Term

+ References

No definition available.

+ Details

Name:	grwg_TradeReceivablePaymentTerm
Namespace Prefix:	grwg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Trade Receivable, Stated Interest Rate

+ References

No definition available.

+ Details

Name:	grwg_TradeReceivableStatedInterestRate
Namespace Prefix:	grwg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: