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Fair Value Measurements
 9 Months Ended
Sep. 30, 2012
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block]

Fair Value Measurements

We value financial instruments using a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices for similar assets or liabilities in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

Financial assets accounted for at fair value on a recurring basis at September 30, 2012 include cash, cash equivalents and short term investments of approximately $9.0 million. The carrying value of these assets approximates fair value due to the short term maturity of these instruments.