Debt Instrument, Additional Principal Amount

No definition available.

Name:	tndm_DebtInstrumentAdditionalPrincipalAmount
Namespace Prefix:	tndm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Capped Call, Net Cost

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Option Indexed To Issuers Equity Cap Price

+ References

No definition available.

+ Details

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Namespace Prefix:	tndm_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
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

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Period Type:	duration

- Definition

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

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Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Balance Type:	na
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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- Definition

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

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Balance Type:	credit
Period Type:	instant

- Definition

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

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- 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.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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Period Type:	duration

- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

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Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

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Debt - Additional Information (Details)			1 Months Ended		3 Months Ended	6 Months Ended
Debt - Additional Information (Details)	Feb. 27, 2026 USD ($) trading_day $ / shares	Mar. 08, 2024 USD ($) trading_day $ / shares	Mar. 31, 2026 USD ($) $ / shares	Mar. 31, 2024 USD ($) $ / shares	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	May 31, 2020
Debt Instrument [Line Items]
Proceeds from convertible senior notes \| $						$ 291,157,000	$ 0
Convertible Senior Notes Due 2025 \| Convertible Senior Notes
Debt Instrument [Line Items]
Interest rate									1.50%
Settlement of debt \| $					$ 40,800,000
Convertible Senior Notes Due 2029 \| Convertible Senior Notes
Debt Instrument [Line Items]
Interest rate		1.50%
Principal amount: \| $		$ 316,300,000				316,250,000		$ 316,250,000
Net proceeds from issuance of convertible notes \| $		$ 306,800,000
Debt instrument, convertible, conversion ratio		0.0289361
Conversion price (in dollars per share) \| $ / shares		$ 34.56
Debt instrument, convertible, threshold trading days		20
Debt instrument, convertible, threshold trading days consecutive trading days		30
Redemption price percentage		100.00%
Principal amount \| $						0
Capped call transactions net cost \| $				$ 15,800,000
Debt instrument, initial cap price per share (in dollars per share) \| $ / shares				$ 42.01
Convertible Senior Notes Due 2029 \| Convertible Senior Notes \| Conversion Instance, 130%
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days		20
Debt instrument, convertible, threshold trading days consecutive trading days		30
Convertible Senior Notes Due 2029 \| Convertible Senior Notes \| Conversion Instance, 98%
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days		5
Debt instrument, convertible, threshold trading days consecutive trading days		10
Convertible Senior Notes Due 2029 \| Convertible Senior Notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger		130.00%
Convertible Senior Notes Due 2029 \| Convertible Senior Notes \| Minimum \| Conversion Instance, 130%
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger		130.00%
Convertible Senior Notes Due 2029 \| Convertible Senior Notes \| Minimum \| Conversion Instance, 98%
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger		98.00%
Convertible Senior Notes Due 2032 \| Convertible Senior Notes
Debt Instrument [Line Items]
Interest rate	0.00%
Principal amount: \| $	$ 300,000,000.0					$ 300,000,000
Net proceeds from issuance of convertible notes \| $	$ 291,200,000
Debt instrument, convertible, conversion ratio	0.0270362
Conversion price (in dollars per share) \| $ / shares	$ 36.99
Debt instrument, convertible, threshold trading days	20
Debt instrument, convertible, threshold trading days consecutive trading days	30
Redemption price percentage	100.00%
Additional principal amount \| $	$ 35,000,000.0
Proceeds from convertible senior notes \| $	$ 15,300,000
Capped call transactions net cost \| $			$ 15,300,000
Debt instrument, initial cap price per share (in dollars per share) \| $ / shares			$ 47.08
Convertible Senior Notes Due 2032 \| Convertible Senior Notes \| Conversion Instance, 130%
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days	20
Debt instrument, convertible, threshold trading days consecutive trading days	30
Convertible Senior Notes Due 2032 \| Convertible Senior Notes \| Conversion Instance, 98%
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days	5
Debt instrument, convertible, threshold trading days consecutive trading days	10
Convertible Senior Notes Due 2032 \| Convertible Senior Notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger	130.00%
Convertible Senior Notes Due 2032 \| Convertible Senior Notes \| Minimum \| Conversion Instance, 130%
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger	130.00%
Convertible Senior Notes Due 2032 \| Convertible Senior Notes \| Minimum \| Conversion Instance, 98%
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger	98.00%