XML 56 R46.htm IDEA: XBRL DOCUMENT v3.21.2

Convertible Preferred Stock - Additional Information (Detail) $ / shares in Units, $ in Thousands							1 Months Ended		6 Months Ended	12 Months Ended
	Jun. 25, 2021 shares	Jan. 31, 2020 USD ($) $ / shares shares	Feb. 28, 2019 USD ($) $ / shares shares	Feb. 28, 2018 USD ($) shares $ / shares	Sep. 30, 2016 USD ($) shares	Aug. 31, 2015 USD ($) shares	Jun. 30, 2012 USD ($) shares	Oct. 31, 2011 USD ($) shares	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Oct. 01, 2011 USD ($)
Temporary Equity [Line Items]
Shares authorized | shares										135,936,731
Proceeds from Issuance of Redeemable Convertible Preferred Stock										$ 99,414
Stock Purchase Agreement with Venture Investor
Temporary Equity [Line Items]
Funding commitment											$ 10,000
Stock Purchase Agreement with Venture Investor First Tranche
Temporary Equity [Line Items]
Funding commitment											5,000
Stock Purchase Agreement with Venture Investor Second Tranche
Temporary Equity [Line Items]
Funding commitment											$ 5,000
Convertible Preferred Stock
Temporary Equity [Line Items]
Shares authorized | shares									5,000,000	135,936,731
Temporary equity, par value | $ / shares									$ 0.001	$ 0.001
Dividend rate percentage									8.00%
Dividends temperory stock									$ 0	$ 0
Convertible Preferred Stock | Conversion of Preferred Stock into a share of Common Stock | Common Stock
Temporary Equity [Line Items]
Number of common stock issued for convertible preferred stock | shares	5,365,899
Common stock, conversion ratio	0.0322%
Series A Convertible Preferred Stock
Temporary Equity [Line Items]
Shares authorized | shares										17,000,000
Proceeds from Issuance of Redeemable Convertible Preferred Stock					$ 5,000	$ 2,000				$ 16,982
Temporary equity stock issued during period shares new issues | shares					5,000,000	2,000,000
Series A Convertible Preferred Stock | Stock Purchase Agreement with Venture Investor First Tranche
Temporary Equity [Line Items]
Proceeds from Issuance of Redeemable Convertible Preferred Stock								$ 2,399
Conversion of notes payable and accrued interest								$ 2,601
Temporary equity stock issued during period shares new issues | shares								5,000,000
Converted instrument, amount								$ 2,601
Series A Convertible Preferred Stock | Stock Purchase Agreement with Venture Investor Second Tranche
Temporary Equity [Line Items]
Proceeds from Issuance of Redeemable Convertible Preferred Stock							$ 5,000
Temporary equity stock issued during period shares new issues | shares							5,000,000
Series B Convertible Preferred Stock
Temporary Equity [Line Items]
Shares authorized | shares										25,186,738
Proceeds from Issuance of Redeemable Convertible Preferred Stock										$ 24,943
Series B Convertible Preferred Stock | Conversion of Debt to Series B Convertible Preferred Stock
Temporary Equity [Line Items]
Conversion of notes payable and accrued interest				$ 8,000
Debt instrument, convertible, number of equity instruments | shares				25,186,738
Debt instrument, convertible, conversion price | $ / shares				$ 1.00
Converted instrument, amount				$ 8,000
Series B1 Convertible Preferred Stock
Temporary Equity [Line Items]
Shares authorized | shares										93,749,993
Proceeds from Issuance of Redeemable Convertible Preferred Stock		$ 35,000								$ 57,489
Temporary equity stock issued during period shares new issues | shares		43,749,996
Sale of stock, price per share | $ / shares		$ 0.80
Series B1 Convertible Preferred Stock | Conversion of Debt to Series B Convertible Preferred Stock
Temporary Equity [Line Items]
Proceeds from Issuance of Redeemable Convertible Preferred Stock			$ 23,000
Temporary equity stock issued during period shares new issues | shares			28,749,997
Sale of stock, price per share | $ / shares			$ 0.80

X

- Definition

Common stock conversion ratio.

+ References

No definition available.

+ Details

Name:	tpst_CommonStockConversionRatio
Namespace Prefix:	tpst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Dividends temperory stock.

+ References

No definition available.

+ Details

Name:	tpst_DividendsTemperoryStock
Namespace Prefix:	tpst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Temporary equity shares noncumulative dividend rate percentage.

+ References

No definition available.

+ Details

Name:	tpst_TemporaryEquitySharesNoncumulativeDividendRatePercentage
Namespace Prefix:	tpst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Temporary equity stock issued during period shares new issues.

+ References

No definition available.

+ Details

Name:	tpst_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	tpst_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

+ Details

Name:	us-gaap_ConversionOfStockSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870

+ Details

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

X

- Definition

The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: 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)(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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

X

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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

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

X

- Definition

Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (27)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

X

- Definition

The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

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(27)(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_TemporaryEquitySharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate monetary value of a new issue of securities which have been allocated to investors to buy. When security is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the security to the investor until it receives the entire proceeds. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

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(27)(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=tpst_StockPurchaseAgreementWithVentureInvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=tpst_StockPurchaseAgreementWithVentureInvestorFirstTrancheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=tpst_StockPurchaseAgreementWithVentureInvestorSecondTrancheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_ConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=tpst_SeriesAConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=tpst_SeriesBConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=tpst_SeriesBOneConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: