Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Additional Information (Details)

v2.4.1.9
Organization and Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Debt Instrument [Line Items]      
Net loss $ (5,381,000)us-gaap_NetIncomeLoss $ (4,713,000)us-gaap_NetIncomeLoss  
Cash used in operations (2,971,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (2,001,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations  
Accumulated deficit (177,886,000)us-gaap_RetainedEarningsAccumulatedDeficit   (172,505,000)us-gaap_RetainedEarningsAccumulatedDeficit
Debt instrument, payment terms As discussed further in Note 7, the Company has entered into a term loan with Hercules Technology Growth Capital, Inc. (“Hercules Technology”), as administrative and collateral agent for the lenders thereunder and as lender, and Hercules Technology III, LP, as lender (the “Hercules Term Loan”). The Hercules Term Loan has a liquidity covenant that requires the Company to maintain a cash balance of not less than $9.0 million.    
Cash 14,900,000us-gaap_Cash    
Hercules Term Loan, Liquidity Covenant      
Debt Instrument [Line Items]      
Cash $ 9,000,000us-gaap_Cash
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanLiquidityCovenantMember