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Contract Assets and Contract Liabilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Revenue recognized from contract liabilities	$ 4.4	$ 7.8

X

- Definition

Contract with customer liability revenue recognized including opening balance.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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