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Stock-Based Compensation - Additional Information (Details) (USD $)
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1 Months Ended | 12 Months Ended | |
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Feb. 28, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Cash received from option exercises | $ 77,000us-gaap_ProceedsFromStockOptionsExercised | ||
| Number of stock options granted during the period | 1,448,751us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | ||
| Stock-based compensation expense | 11,001,000us-gaap_AllocatedShareBasedCompensationExpense | 555,000us-gaap_AllocatedShareBasedCompensationExpense | |
| Employee Stock Option | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Weighted average grant date fair value of options granted |
$ 1.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
$ 0.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Intrinsic value of options exercised |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Cash received from option exercises |
0us-gaap_ProceedsFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
77,000us-gaap_ProceedsFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Tax benefit related to options exercised |
0us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
0us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Number of stock options granted during the period |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Restricted stock units | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Fair value of shares vested |
3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
110,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Number of stock options exchanged for RSUs |
93,968amda_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInStockOptionExchangeInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Incremental fair value |
758,000amda_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInStockOptionExchangeInPeriodFairValueIncremental / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Restricted stock units granted during period |
1,815,259us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Stock Options to Non-employees | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Number of stock options granted during the period |
165,387us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
13,191us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
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| Stock-based compensation expense |
$ 712,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
$ 248,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
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| Stock Options to Non-employees | Restricted stock units | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Restricted stock units granted during period |
94,560us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember |
13,121us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember |
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| 2012 Plan | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Shares issuable with respect to awards granted |
3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = amda_TwoThousandTwelvePlanMember |
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| Shares available for grant |
113,914us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = amda_TwoThousandTwelvePlanMember |
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| X | ||||||||||
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- Definition
Number of stock options exchanged for restricted stock units in period. No definition available.
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- Definition
Share based compensation arrangement by share based payment award options grants in stock option exchange in period fair value incremental. No definition available.
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| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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