Consolidated Statements of Operations and Comprehensive Loss (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Product revenue	$ 22,765us-gaap_SalesRevenueNet	$ 22,314us-gaap_SalesRevenueNet
Costs of revenue	7,910us-gaap_CostOfRevenue	7,045us-gaap_CostOfRevenue
Gross profit	14,855us-gaap_GrossProfit	15,269us-gaap_GrossProfit
Operating expenses:
Research and development	6,742us-gaap_ResearchAndDevelopmentExpense	3,461us-gaap_ResearchAndDevelopmentExpense
General and administrative	13,588us-gaap_GeneralAndAdministrativeExpense	5,759us-gaap_GeneralAndAdministrativeExpense
Sales and marketing	18,692us-gaap_SellingAndMarketingExpense	16,384us-gaap_SellingAndMarketingExpense
Total operating expenses	39,022us-gaap_OperatingExpenses	25,604us-gaap_OperatingExpenses
Loss from operations	(24,167)us-gaap_OperatingIncomeLoss	(10,335)us-gaap_OperatingIncomeLoss
Other income (expense):
Interest income	12us-gaap_InvestmentIncomeInterest	16us-gaap_InvestmentIncomeInterest
Interest expense	(3,650)us-gaap_InterestExpense	(1,851)us-gaap_InterestExpense
Loss on extinguishment of debt	(2,194)
Change in fair value of derivative liabilities	(251)	3,970
Offering costs	(2,026)amda_OfferingCost
Other expense	(306)us-gaap_OtherNonoperatingIncomeExpense	(86)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense)	(8,415)us-gaap_NonoperatingIncomeExpense	2,049us-gaap_NonoperatingIncomeExpense
Net loss before income taxes	(32,582)	(8,286)
Net Loss	(32,582)us-gaap_NetIncomeLoss	(8,286)us-gaap_NetIncomeLoss
Other comprehensive loss, net of tax:
Unrealized loss on marketable securities		(2)
Total comprehensive loss	$ (32,582)us-gaap_ComprehensiveIncomeNetOfTax	$ (8,288)us-gaap_ComprehensiveIncomeNetOfTax
Net loss per share attributable to common stockholders:
Basic and diluted	$ (2.66)us-gaap_EarningsPerShareBasicAndDiluted	$ (15.52)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding:
Basic and diluted	12,239,953	534,073

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