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11. Stock-Based Compensation (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Options    
Number of Outstanding, Ending 980 1,015
Weighted Average Exercise Price Outstanding, Ending $ 5.76 $ 5.52
Remaining Contractual Term (In Years) 3 years 3 months 18 days 2 years 11 months 23 days
Average Intrinsic Value [1] $ 0 $ 1,026
Vested Options    
Number of Outstanding, Ending 687 367
Weighted Average Exercise Price Outstanding, Ending $ 6.49 $ 4.95
Remaining Contractual Term (In Years) 2 years 3 months 25 days 3 years 10 months 13 days
Average Intrinsic Value [1] $ 0 $ 356
Unvested Options    
Number of Outstanding, Ending 293 648
Weighted Average Exercise Price Outstanding, Ending $ 4.06 $ 5.84
Remaining Contractual Term (In Years) 5 years 7 months 2 days 2 years 5 months 19 days
Average Intrinsic Value [1] $ 0 $ 670
[1] Intrinsic value based on the $2.90 and $5.79 closing price of Aemetis stock on December 31, 2015 and 2014 respectively, as reported on the NASDAQ Exchange and Over the Counter Bulletin Board respectively.