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Organization and Significant Accounting Policies - Additional Information (Details)	6 Months Ended
	Jun. 30, 2025
Maximum
Significant Accounting Policies [Line Items]
Percentage of revenue from other distinct performance obligations of total revenue	10.00%

X

- Definition

Percentage of revenue from other distinct performance obligations of revenue.

+ References

No definition available.

+ Details

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

X

- Definition

Significant accounting policies.

+ References

No definition available.

+ Details

Name:	atec_SignificantAccountingPoliciesLineItems
Namespace Prefix:	atec_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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