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Fair Value Measurement of Assets and Liabilities (Details) (Fair Value, Measurements, Recurring [Member], USD $)
Sep. 30, 2011
Dec. 31, 2010
Assets  
Total financial Assets$ 57,652,611$ 53,426,580
Quoted Prices in active markets for identical Assets (Level 1) [Member] | Money Market Funds [Member]
  
Assets  
Cash and Cash Equivalents14,533,59914,578,477
Quoted Prices in active markets for identical Assets (Level 1) [Member] | Asset backed securities [Member]
  
Assets  
Investments17,762,52114,319,103
Quoted Prices in active markets for identical Assets (Level 1) [Member] | Sovereign Debt Securities [Member]
  
Assets  
Investments10,635,82213,147,239
Quoted Prices in active markets for identical Assets (Level 1) [Member] | Corporate Debt Securities [Member]
  
Assets  
Investments14,720,66911,381,761
Quoted Prices in active markets for identical Assets (Level 1) [Member]
  
Assets  
Total financial Assets57,652,61153,426,580
Money Market Funds [Member]
  
Assets  
Cash and Cash Equivalents14,533,59914,578,477
Asset backed securities [Member]
  
Assets  
Investments17,762,52114,319,103
Sovereign Debt Securities [Member]
  
Assets  
Investments10,635,82213,147,239
Corporate Debt Securities [Member]
  
Assets  
Investments$ 14,720,669$ 11,381,761