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Related Party Transactions - Additional Information (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Healthpoint Capital [Member]    
Related Party Transaction [Line Items]    
Incurred expenses (less than) $ 100,000us-gaap_CostsAndExpensesRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= atec_HealthpointCapitalMember		 $ 100,000us-gaap_CostsAndExpensesRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= atec_HealthpointCapitalMember
Payable liability 100,000us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= atec_HealthpointCapitalMember		  
New York Orthotec matter [Member]    
Related Party Transaction [Line Items]    
Legal expenses (less than $0.1 million) $ 0us-gaap_LegalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= atec_OrthotecMatterMember		 $ 100,000us-gaap_LegalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= atec_OrthotecMatterMember
Number of former directors 2atec_NumberofFormerDirectorswithIndemnificationAgreements
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= atec_OrthotecMatterMember