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Contract Assets and Contract Liabilities - Opening and Closing Balances of Company's Contract Liability (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] |  |  |  |
Balance at December 31, 2022 |  |  | $ 15,003 |
Payments received |  |  | 13,541 |
Revenue recognized | $ (6,200) | $ (5,800) | (11,118) | $ (10,100)
Foreign currency fluctuation |  |  | 105 |
Balance at June 30, 2023 | $ 17,531 |  | $ 17,531 |

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- Definition Contract with customer liability, foreign currency fluctuation. + References No definition available. + Details
Name: | atec_ContractWithCustomerLiabilityForeignCurrencyFluctuation
Namespace Prefix: | atec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with customer liability payments received. + References No definition available. + Details
Name: | atec_ContractWithCustomerLiabilityPaymentsReceived
Namespace Prefix: | atec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- References No definition available. + Details
Name: | us-gaap_ContractWithCustomerAssetAndLiabilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant