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Contract Assets and Contract Liabilities - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Revenue recognized from contract liabilities	$ 0.9

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