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Stock-Based Compensation - Additional Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 1 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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Jan. 31, 2015
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Stock-based compensation expense | $ 660us-gaap_AllocatedShareBasedCompensationExpense | $ 1,404us-gaap_AllocatedShareBasedCompensationExpense | |
| Number of stock options granted during the period | 1,485,759us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | ||
| RSUs | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Fair value of shares vested |
23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Stock-based compensation expense |
$ 23us-gaap_AllocatedShareBasedCompensationExpense / 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 |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
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| 2012 Plan | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Shares issuable with respect to awards granted, additional |
586,181us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = amda_TwoThousandTwelvePlanMember |
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| Shares issuable with respect to awards granted |
3,586,181us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = amda_TwoThousandTwelvePlanMember |
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| Shares available for grant |
115,082us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = amda_TwoThousandTwelvePlanMember |
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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
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
Number of additional shares authorized for issuance under an established share-based compensation plan. No definition available.
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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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- 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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- Details
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- Details
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- Details
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