Deferred Revenue	12 Months Ended
Deferred Revenue	Dec. 31, 2012
Deferred Revenue
Deferred Revenue	18. Deferred Revenue Current deferred revenue included $99,517 (December 31, 2011 - $97,412) received from the Chinese government for stockpiling of H5N1 vaccines that expire within one year and $1,278,908 (December 31, 2011 - $332,004) for advances from customers. Long-term deferred revenue included $10,693,247 (December 31, 2011 - $10,369,695) received from the Chinese government for stockpiling of H5N1 vaccines.

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.

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