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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY (Unaudited) (Parenthetical) $ in Thousands | 3 Months Ended
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Jun. 30, 2021 USD ($)
Public Offering |
Common stock, offering costs | $ 6,200

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- Definition Common stock offering costs. + References No definition available. + Details
Name: | atec_CommonStockOfferingCosts
Namespace Prefix: | atec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |