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12. Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues    
North America $ 33,207AMTX_NorthAmerica $ 59,081AMTX_NorthAmerica
India 1,519AMTX_India 1,584AMTX_India
Total revenues 34,726AMTX_TotalRevenues 60,665AMTX_TotalRevenues
Cost of goods sold    
North America 33,369AMTX_NorthAmerica1 43,409AMTX_NorthAmerica1
India 1,585AMTX_India1 1,632AMTX_India1
Total cost of goods sold 34,954AMTX_TotalCostOfGoodsSold 45,041AMTX_TotalCostOfGoodsSold
Gross profit (loss)    
North America (162)AMTX_NorthAmerica2 15,672AMTX_NorthAmerica2
India (66)AMTX_India2 (48)AMTX_India2
Total gross profit (loss) $ (228)AMTX_TotalGrossLoss $ 15,624AMTX_TotalGrossLoss