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Retirement Plan - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($)
Defined Contribution Plan Disclosure [Line Items] |
Matching contributions by employer | 4.00%
Employer matching contribution, vesting period | 1 year
Section 401(k) plan [Member] |
Defined Contribution Plan Disclosure [Line Items] |
Total contributions | $ 0.6

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- Definition Defined Contribution Plan Employer Contribution Vesting Period + References No definition available. + Details
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Namespace Prefix: | atec_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPlanNameAxis=atec_FourZeroOneKPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |