Debt instrument extended maturity year.

No definition available.

Name:	atec_DebtInstrumentExtendedMaturityYear
Namespace Prefix:	atec_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument interest-free rate amount from commercial banks.

+ References

No definition available.

+ Details

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Namespace Prefix:	atec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument interest rate amount from lender.

+ References

No definition available.

+ Details

Name:	atec_DebtInstrumentInterestRateAmountFromLender
Namespace Prefix:	atec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument loan extended additional period.

+ References

No definition available.

+ Details

Name:	atec_DebtInstrumentLoanExtendedAdditionalPeriod
Namespace Prefix:	atec_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of loan agreements.

+ References

No definition available.

+ Details

Name:	atec_NumberOfLoanAgreements
Namespace Prefix:	atec_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of cost of state guaranty.

+ References

No definition available.

+ Details

Name:	atec_PercentageOfCostOfStateGuaranty
Namespace Prefix:	atec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal state guaranteed.

+ References

No definition available.

+ Details

Name:	atec_PercentageOfPrincipalStateGuaranteed
Namespace Prefix:	atec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of weighted average cost of state guaranty.

+ References

No definition available.

+ Details

Name:	atec_PercentageOfWeightedAverageCostOfStateGuaranty
Namespace Prefix:	atec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482900/835-30-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-2

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-6

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

+ Details

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

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

+ Details

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Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=atec_EOSImagingSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Debt - Other Debt Agreements (Details) - EOS Imaging S.A. $ in Millions	1 Months Ended	4 Months Ended	12 Months Ended
	Feb. 28, 2022	Apr. 30, 2021 USD ($) Agreement	Dec. 31, 2023 USD ($)
Line Of Credit Facility [Line Items]
Number of loan agreements \| Agreement		2
Debt instrument term	12 months	12 months
Percentage of principal state guaranteed		90.00%
Percentage of cost of state guaranty		0.25%
Debt instrument interest-free rate amount		$ 3.6
Effective interest rate		1.75%
Debt instrument interest rate amount		$ 1.6
Line of credit facility description			The loan capital and loan guaranty costs are payable in full at the end of the 12-month term or the loan may be extended up to 5 additional years.
Debt instrument, extended maturity year	2027
Loan One
Line Of Credit Facility [Line Items]
Outstanding loan obligation			$ 3.1
Weighted average interest rate on loan			0.98%
Percentage of weighted average cost of state guaranty			0.69%
Loan Two
Line Of Credit Facility [Line Items]
Outstanding loan obligation			$ 1.4
Weighted average interest rate on loan			1.25%
Percentage of weighted average cost of state guaranty			1.00%
Maximum
Line Of Credit Facility [Line Items]
Debt instrument loan extended additional period		5 years