Represents the first customary conversion blockers under debt instrument.

No definition available.

Name:	thmo_DebtInstrumentConvertibleFirstCustomaryConversionBlockers
Namespace Prefix:	thmo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the second customary conversion blockers under debt instrument.

+ References

No definition available.

+ Details

Name:	thmo_DebtInstrumentConvertibleSecondCustomaryConversionBlockers
Namespace Prefix:	thmo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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Name:	us-gaap_AmortizationOfDebtDiscountPremium
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 3
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Name:	us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

+ Details

Name:	us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 8
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Name:	us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (b)
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+ Details

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

- Definition

The net amount of operating interest income (expense).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.10)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

Name:	us-gaap_InterestIncomeExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net amount of nonoperating interest income (expense).

+ References

No definition available.

+ Details

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

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=thmo_ConversionOfConvertiblePromissoryNoteToCommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=thmo_NotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=thmo_January2019NotesAmendmentNo1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=thmo_TheJuly2019NoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 7 - Convertible Promissory Notes (Details Textual) - USD ($)				12 Months Ended
	Jun. 04, 2020	Jul. 23, 2019	Jan. 29, 2019	Dec. 31, 2020	Dec. 31, 2019	May 30, 2019
Gain (Loss) on Extinguishment of Debt, Total					$ (840,000)
Amortization of Debt Discount (Premium)				5,558,000	2,349,000
Debt Conversion, Converted Instrument, Amount				3,368,000	432,000
Conversion of Convertible Promissory Note to Common Stock [Member]
Debt Conversion, Converted Instrument, Amount				$ 368,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)				204,445
Interest Income (Expense), Nonoperating, Net				$ 46,000
Convertible Debt [Member] \| Notes [Member]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger			90.00%
Debt Instrument, Interest Rate, Stated Percentage			24.00%
Debt Instrument, Term (Month)			1 year 180 days
Debt Instrument, Convertible, First Customary Conversion Blockers			4.99%
Debt Instrument, Convertible, Second customary conversion blockers			9.99%
Debt Instrument, Unamortized Discount, Total						$ 800,000
Convertible Debt [Member] \| Notes [Member] \| Maximum [Member]
Debt Instrument, Face Amount			$ 800,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)			$ 1.80
Convertible Debt [Member] \| Notes [Member] \| Minimum [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)			$ 0.50
Convertible Debt [Member] \| January 2019 Notes, Amendment No. 1 [Member]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger				90.00%
Debt Instrument, Unamortized Discount, Total					556,000
Gain (Loss) on Extinguishment of Debt, Total					840,000
Long-term Debt, Fair Value		$ 1,473,000
Amortization of Debt Discount (Premium)					$ 77,000
Convertible Debt [Member] \| January 2019 Notes, Amendment No. 1 [Member] \| Maximum [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)				$ 1.80
Convertible Debt [Member] \| January 2019 Notes, Amendment No. 1 [Member] \| Minimum [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)				$ 0.50
Convertible Debt [Member] \| The July 2019 Note [Member]
Debt Instrument, Face Amount		$ 1,000,000
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		90.00%
Debt Instrument, Interest Rate, Stated Percentage		24.00%
Debt Conversion, Converted Instrument, Shares Issued (in shares)					240,000
Debt Conversion, Original Debt, Amount					$ 432,000
Interest Income (Expense), Net, Total					$ 60,000
Debt Instrument, Convertible, Beneficial Conversion Feature	$ 694,000
Convertible Debt [Member] \| The July 2019 Note [Member] \| Maximum [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)		$ 1.80
Convertible Debt [Member] \| The July 2019 Note [Member] \| Minimum [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share)		$ 0.50