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16. Income Tax (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
United States	$ 8,652us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	$ (24,712)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	$ (2,981)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign	(1,513)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	281us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	(2,382)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Pretax Income	$ 7,139AMTX_LossBeforeIncomeTaxes	$ (24,431)AMTX_LossBeforeIncomeTaxes	$ (5,363)AMTX_LossBeforeIncomeTaxes

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-08.(h)(1)(i))

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 235

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-Subparagraph (SX 210.4-08.(h)(1)(i))

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