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

Equity - Summary of Conversion Ratio of Each Series of Convertible Preferred Stock at Time of Conversion (Details)

v2.4.1.9
Equity - Summary of Conversion Ratio of Each Series of Convertible Preferred Stock at Time of Conversion (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Series A    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0388us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesAConvertiblePreferredStockMember
0.0388us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesAConvertiblePreferredStockMember
Series A-1    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0582us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesAOneConvertiblePreferredStockMember
0.0582us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesAOneConvertiblePreferredStockMember
Series B    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0414us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesBConvertiblePreferredStockMember
0.0414us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesBConvertiblePreferredStockMember
Series B-1    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0591us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesBOneConvertiblePreferredStockMember
0.0591us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesBOneConvertiblePreferredStockMember
Series C    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0435us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesCConvertiblePreferredStockMember
0.0435us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesCConvertiblePreferredStockMember
Series C-1    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0631us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesCOneConvertiblePreferredStockMember
0.0631us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesCOneConvertiblePreferredStockMember
Series D    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0505us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesDConvertiblePreferredStockMember
0.0505us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesDConvertiblePreferredStockMember
Series D-1    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0653us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesDOneConvertiblePreferredStockMember
0.0653us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesDOneConvertiblePreferredStockMember
Series E    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.0441us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesEConvertiblePreferredStockMember
0.0441us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesEConvertiblePreferredStockMember
Series F    
Class Of Stock [Line Items]    
Conversion ratio of convertible preferred stock at time of conversion 0.2500us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesFConvertiblePreferredStockMember
0.0388us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= amda_SeriesFConvertiblePreferredStockMember