Repayment of accrued interest.

No definition available.

Name:	atec_RepaymentOfAccruedInterest
Namespace Prefix:	atec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Repayment of outstanding principal.

+ References

No definition available.

+ Details

Name:	atec_RepaymentOfOutstandingPrincipal
Namespace Prefix:	atec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
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

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Details

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

Debt - Inventory Financing Agreement (Details) - Inventory Financing Agreement - USD ($)	Aug. 10, 2021	Dec. 31, 2022	May 31, 2021	Nov. 30, 2020	Nov. 30, 2018
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 6,000,000.0	$ 6,000,000.0	$ 3,000,000.0
Current availability		$ 9,000,000.0
Repaid of outstanding principal	$ 8,100,000
Accrued interest	$ 100,000