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Cross Medical - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 1 Months Ended
Aug. 02, 2012
Installment
Jan. 31, 2012
Dec. 31, 2014
Guarantees And Letters Of Credit [Line Items]      
Initial payment towards settlement   $ 5atec_AgreementSettlementInitialPayment  
Number of quarterly payments 13atec_NumberOfInstallmentPayments    
Contractual obligations, due in 2015     3us-gaap_ContractualObligationDueInNextTwelveMonths
Thirteen quarterly payments [Member]      
Guarantees And Letters Of Credit [Line Items]      
Initial payment towards settlement 1atec_AgreementSettlementInitialPayment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= atec_QuarterlyPaymentsMember