Annual report pursuant to Section 13 and 15(d) 12-31-2014

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 $)
0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended
Feb. 11, 2014
Jan. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Feb. 12, 2014
Nov. 26, 2014
Organization And Summary Of Significant Accounting Policies [Line Items]            
Net loss     $ (32,582,000)us-gaap_NetIncomeLoss $ (8,286,000)us-gaap_NetIncomeLoss    
Cash used in operations     (14,522,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (9,949,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations    
Accumulated deficit     (172,505,000)us-gaap_RetainedEarningsAccumulatedDeficit (139,923,000)us-gaap_RetainedEarningsAccumulatedDeficit    
Debt instrument, payment terms     As discussed further in Note 7, the Company refinanced its long-term debt and 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 in excess of $9.0 million      
Cash     18,200,000us-gaap_Cash      
Stock issued during period, shares, reverse stock splits 0.0388us-gaap_StockholdersEquityNoteStockSplitConversionRatio1          
Common stock shares, issued     50,583us-gaap_StockIssuedDuringPeriodSharesNewIssues      
Proceeds from issuance of common stock, net of issuance costs     15,369,000us-gaap_ProceedsFromIssuanceOfCommonStock      
Allowance for bad debts     54,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 49,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts    
Bad debt expense     65,000us-gaap_ProvisionForDoubtfulAccounts 5,000us-gaap_ProvisionForDoubtfulAccounts    
Percentage of excise tax included in cost of revenue   2.30%amda_PercentageOfExciseTaxIncludedInCostOfRevenue        
Estimated useful lives     5 years      
Impairment loss for property and equipment     0us-gaap_PropertyPlantAndEquipmentDisposals 0us-gaap_PropertyPlantAndEquipmentDisposals    
Impairment loss for finite-lived intangible assets     0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived    
Goodwill impairment     0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss    
Impairment loss for indefinite-lived intangible assets     0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill    
Advertising expense     149,000us-gaap_AdvertisingExpense 403,000us-gaap_AdvertisingExpense    
Interest or penalties     0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense    
Deferred offering costs       2,763,000us-gaap_DeferredOfferingCosts    
Minimum            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Estimated useful lives     3 years      
Maximum            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Estimated useful lives     5 years      
Accounts Receivable | Customer Concentration Risk            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Concentration risk percentage     10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
   
Number of customers     0amda_NumberOfConcentrationCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
1amda_NumberOfConcentrationCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
   
Sales Revenue, Net | Customer Concentration Risk            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Concentration risk percentage     28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
   
Number of customers     2amda_NumberOfConcentrationCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
1amda_NumberOfConcentrationCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
   
IPO            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Common stock shares, issued         3,682,900us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Preferred stock, par value         $ 5.75us-gaap_EquityIssuancePerShareAmount
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Proceeds from issuance of common stock, net of issuance costs         15,400,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Underwriting discounts and other offering costs         5,800,000us-gaap_ExpenseRelatedToDistributionOrServicingAndUnderwritingFees
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
IPO | Underwriter Option            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Common stock shares, issued         182,900us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CounterpartyNameAxis
= amda_UnderwriterOptionMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Secondary Offering            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Common stock shares, issued           11,441,646us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= amda_SecondaryOfferingMember
Proceeds from issuance of common stock, net of issuance costs           11,300,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= amda_SecondaryOfferingMember
Underwriting discounts and other offering costs           1,700,000us-gaap_ExpenseRelatedToDistributionOrServicingAndUnderwritingFees
/ us-gaap_SubsidiarySaleOfStockAxis
= amda_SecondaryOfferingMember
Common stock share issue price under secondary offering, per share price           $ 1.14us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= amda_SecondaryOfferingMember
Sale of stock, description of transaction     The Company completed a secondary offering, in which the Company sold and issued 11,441,646 units. Each unit was issued at a price of $1.14 and consisted of one share of common stock and one common stock warrant      
Hercules Term Loan            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents     $ 9,000,000amda_TermLoanCashMinimumCovenant
/ us-gaap_DebtInstrumentAxis
= amda_HerculesTermLoanMember