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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities:    
Net loss $ (4,561)us-gaap_NetIncomeLoss $ (6,673)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in by operating activities:    
Depreciation and amortization 4,162us-gaap_DepreciationDepletionAndAmortization 4,851us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation 1,253us-gaap_ShareBasedCompensation 944us-gaap_ShareBasedCompensation
Interest expense related to amortization of debt discount and debt issuance costs 1,394us-gaap_AmortizationOfFinancingCostsAndDiscounts 430us-gaap_AmortizationOfFinancingCostsAndDiscounts
Provision for doubtful accounts 0us-gaap_ProvisionForDoubtfulAccounts 178us-gaap_ProvisionForDoubtfulAccounts
Provision for excess and obsolete inventory 583us-gaap_InventoryWriteDown 713us-gaap_InventoryWriteDown
Deferred income tax expense 233us-gaap_DeferredIncomeTaxExpenseBenefit 106us-gaap_DeferredIncomeTaxExpenseBenefit
Other non-cash items (133)us-gaap_OtherNoncashIncomeExpense (335)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:    
Restricted cash 1,100us-gaap_IncreaseDecreaseInRestrictedCash (17,750)us-gaap_IncreaseDecreaseInRestrictedCash
Accounts receivable 1,263us-gaap_IncreaseDecreaseInAccountsReceivable 2,560us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (686)us-gaap_IncreaseDecreaseInInventories (1,239)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 335us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (72)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets 3us-gaap_IncreaseDecreaseInOtherOperatingAssets (128)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable (487)us-gaap_IncreaseDecreaseInAccountsPayable 4,036us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses and other (6,712)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (3,984)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Deferred revenues 30us-gaap_IncreaseDecreaseInDeferredRevenue (18)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used in operating activities (2,223)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (16,381)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities:    
Purchases of property and equipment (3,462)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,794)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash received from sale of assets 0us-gaap_ProceedsFromSaleOfIntangibleAssets 300us-gaap_ProceedsFromSaleOfIntangibleAssets
Net cash used in investing activities (3,462)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,494)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities:    
Borrowings under lines of credit 38,951us-gaap_ProceedsFromLinesOfCredit 39,021us-gaap_ProceedsFromLinesOfCredit
Repayments under lines of credit (40,227)us-gaap_RepaymentsOfLinesOfCredit (36,601)us-gaap_RepaymentsOfLinesOfCredit
Principal payments on capital lease obligations (196)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (120)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from notes payable 0us-gaap_ProceedsFromNotesPayable 19,500us-gaap_ProceedsFromNotesPayable
Principal payments on notes payable (2,234)us-gaap_ProceedsFromRepaymentsOfNotesPayable (1,488)us-gaap_ProceedsFromRepaymentsOfNotesPayable
Net cash (used in) provided by financing activities (3,706)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 20,312us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash 1,056us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (18)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash (8,335)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,419us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash at beginning of period 19,735us-gaap_CashAndCashEquivalentsAtCarryingValue 21,345us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash at end of period 11,400us-gaap_CashAndCashEquivalentsAtCarryingValue 23,764us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,856us-gaap_InterestPaid 1,189us-gaap_InterestPaid
Cash paid for income taxes 265us-gaap_IncomeTaxesPaid 142us-gaap_IncomeTaxesPaid
Purchases of property and equipment in accounts payable 886us-gaap_CapitalExpendituresIncurredButNotYetPaid 1,711us-gaap_CapitalExpendituresIncurredButNotYetPaid
Non-cash debt discount 0atec_NoncashDebtDiscount 500atec_NoncashDebtDiscount
Initial fair value of warrant liability $ 0atec_InitialFairValueofWarrantLiability $ 10,368atec_InitialFairValueofWarrantLiability