Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Details)

v2.4.1.9
Debt - Additional Information (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Aug. 11, 2014
Debt Instrument [Line Items]            
Original principal amount $ 24,298,000us-gaap_DebtInstrumentFaceAmount     $ 24,500,000us-gaap_DebtInstrumentFaceAmount    
Cash and cash equivalents 14,882,000us-gaap_CashAndCashEquivalentsAtCarryingValue 13,257,000us-gaap_CashAndCashEquivalentsAtCarryingValue   18,247,000us-gaap_CashAndCashEquivalentsAtCarryingValue 2,279,000us-gaap_CashAndCashEquivalentsAtCarryingValue  
Loss on extinguishment of debt 79,000us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt        
Hercules Term Loan            
Debt Instrument [Line Items]            
Original principal amount 20,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
  20,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
20,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
   
Debt and line of credit maturity date Jan. 01, 2018          
Term loan fee amount     200,000us-gaap_DebtInstrumentFeeAmount
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
     
Final payment fee for debt     1,500,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
     
Termination fee     1,200,000amda_EarlyTerminationFee
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
     
Debt description The Hercules Term Loan also includes a non-refundable final payment fee of $1.5 million.  The final payment fee is being accrued and recorded to interest expense over the life of the loan. The Hercules Term Loan also has an early termination fee of $1.2 million if the loan is paid prior to July 1, 2015.          
Debt instrument, fixed rate 10.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
         
Debt instrument, interest rate description The Hercules Term Loan bears interest at the rate of the greater of either (i) the prime rate plus 7.7%, and (ii) 10.95%.           
Debt instrument, periodic payment, principal 700,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
         
Term loan, payment terms  Interest accrues from the closing date of the loan and interest payments are due monthly. Principal payments are required commencing August 1, 2015 and are to be made in 30 equal installments of approximately $700,000, with the remainder due at maturity.           
Debt instrument, covenant description The Hercules Term Loan contains certain covenants related to restrictions on payments to certain Company affiliates, financial reporting requirements and a minimum liquidity covenant that requires the Company to maintain cash and cash equivalents of not less than $9 million.           
Debt instrument, covenant compliance Although the Company was in compliance with the liquidity covenant at March 31, 2015, the Company anticipates that it will be non-compliant with the liquidity covenant during the fourth quarter of 2015 if additional financing is not obtained, and has therefore classified the entire obligation as a current liability.            
Hercules Term Loan | Maximum            
Debt Instrument [Line Items]            
Number of installments for principal payments 30amda_NumberOfInstallmentsForPrincipalPayments
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Hercules Term Loan | Minimum            
Debt Instrument [Line Items]            
Cash and cash equivalents 9,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Hercules Term Loan | Prime rate plus            
Debt Instrument [Line Items]            
Debt instrument, variable interest rate 7.70%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
         
Conversion Feature of Note            
Debt Instrument [Line Items]            
Original principal amount     2,900,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= amda_MagnaInitialConvertibleNotesMember
     
Debt instrument purchase price 798,000amda_DebtInstrumentPurchasePrice
/ us-gaap_DebtInstrumentAxis
= amda_MagnaInitialConvertibleNotesMember
  2,500,000amda_DebtInstrumentPurchasePrice
/ us-gaap_DebtInstrumentAxis
= amda_MagnaInitialConvertibleNotesMember
     
Magna Additional Convertible Notes            
Debt Instrument [Line Items]            
Original principal amount           3,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= amda_MagnaAdditionalConvertibleNotesMember
Debt instrument purchase price 3,500,000amda_DebtInstrumentPurchasePrice
/ us-gaap_DebtInstrumentAxis
= amda_MagnaAdditionalConvertibleNotesMember
        3,500,000amda_DebtInstrumentPurchasePrice
/ us-gaap_DebtInstrumentAxis
= amda_MagnaAdditionalConvertibleNotesMember
Debt and line of credit maturity date Aug. 11, 2016          
Magna Convertible Notes            
Debt Instrument [Line Items]            
Original principal amount 4,298,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= amda_MagnaConvertibleNotesMember
    4,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= amda_MagnaConvertibleNotesMember
   
Debt and line of credit maturity date Jun. 30, 2016          
Debt instrument, fixed rate 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= amda_MagnaConvertibleNotesMember
         
Debt instrument, interest rate description The Initial Convertible Note and the Additional Convertible Note mature on June 30, 2016 and August 11, 2016, respectively, (subject to extension by the holder) and accrue interest at an annual rate of 6.0%.          
Common stock at a fixed conversion price $ 3.75us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= amda_MagnaConvertibleNotesMember
         
Percentage of volume weighted average price 80.00%amda_DebtInstrumentConversionPercentageOfVolumeWeightedAveragePrice
/ us-gaap_DebtInstrumentAxis
= amda_MagnaConvertibleNotesMember
         
Convertible notes $ 202,000us-gaap_ConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= amda_MagnaConvertibleNotesMember
         
Number of shares converted 373us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_DebtInstrumentAxis
= amda_MagnaConvertibleNotesMember