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Debt - Term Loan (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 06, 2023	Jun. 30, 2023	Jun. 30, 2023
Debt Instrument [Line Items]
Initial term loan facility		$ 457,548	$ 457,548
Braidwell Term Loan | Braidwell Transaction Holdings, LLC
Debt Instrument [Line Items]
Long term debt	$ 150,000
Initial term loan facility	100,000
Option to draw amount	$ 50,000
Credit facility outstanding balance		$ 100,000	$ 100,000
Effective interest rate		11.11%	11.11%
Debt instrument, maturity date	Jan. 06, 2028
Interest rate		11.00%	11.00%
Interest expenses		$ 2,900	$ 5,600
Amortization of debt issuance costs		100	200
Amortization of debt discount		100	100
Debt discount		900	900
Debt issuance costs incurred	$ 3,400	2,100	2,100
Commitment fees incurred	$ 1,500
Undrawn commitment fee	1.00%
Final payment fee percentage	3.25%
Interest rate terms	Borrowings under the Braidwell Term Loan bear interest at a rate per annum equal to the Term Secured Overnight Financing Rate for such SOFR business day ("SOFR") subject to a 3% floor, plus 5.75%.
Braidwell Term Loan | Braidwell Transaction Holdings, LLC | Undrawn Portion of Loan
Debt Instrument [Line Items]
Debt discount		500	500
Debt issuance costs incurred		$ 1,100	$ 1,100
Braidwell Term Loan | Braidwell Transaction Holdings, LLC | Minimum
Debt Instrument [Line Items]
Fee amount percentage	3.00%
Braidwell Term Loan | Braidwell Transaction Holdings, LLC | Maximum
Debt Instrument [Line Items]
Fee amount percentage	1.00%
Braidwell Term Loan | Braidwell Transaction Holdings, LLC | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate per annum	5.75%
Braidwell Term Loan | Braidwell Transaction Holdings, LLC | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate per annum	3.00%

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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+ Details

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

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=atec_BraidwellTermLoanMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=atec_BraidwellTransactionHoldingsLlcMember
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
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X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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X

- Details

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