Deferred Revenue	12 Months Ended
Deferred Revenue	Dec. 31, 2012
Deferred Revenue [Abstract]
Deferred Revenue	5. DEFERRED REVENUE License fees received for which the criteria for revenue recognition have not been met totaled $15,612,000 and $24,366,000 at December 31, 2012 and 2011, respectively. In August 2000, we signed a non-exclusive license agreement with the Commonwealth of Australia, granting the Commonwealth the right to utilize the Syntroleum® Process. As of December 31, 2012 and 2011, we had a remaining license agreement with the Commonwealth of Australia that includes credits against future license fees earned in Australia in the amount of AUD $15,000,000. This license has been recorded as deferred revenue of US $15,557,000 and US $15,261,000 as of December 31, 2012 and 2011, respectively. This license expires in 2019. The license agreement is denominated in Australian dollars and is subject to changes in foreign currency. During the years ended December 31, 2012, 2011, and 2010, the foreign currency effect on our deferred revenues was a change of $(296,000), $(17,000) and $(1,848,000), respectively, as a result of changes in the exchange rate between the United States and Australian dollars.

The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References+ Details