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Fair Value of Financial Instruments (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Fair value          
Charges for other-than-temporary declines in fair value of investments $ 0 $ 0 $ 0 $ 0  
Available-for-sale investment securities with contractual maturity date of more than one but less than two years 37,500,000   37,500,000    
Cash          
Fair value          
Adjusted Cost 10,842,926   10,842,926   $ 7,141,548
Fair Value 10,842,926   10,842,926   7,141,548
Cash and Cash Equivalents | Cash          
Fair value          
Fair Value 10,842,926   10,842,926   7,141,548
Total          
Fair value          
Adjusted Cost 168,929,684   168,929,684   106,922,981
Unrealized Gains     46,007   258
Unrealized Losses     (3,607)   (19,040)
Fair Value 168,972,084   168,972,084   106,904,199
Total | Cash and Cash Equivalents          
Fair value          
Fair Value 39,034,709   39,034,709   36,205,559
Total | Marketable Securities.          
Fair value          
Fair Value 129,937,375   129,937,375   70,698,640
Level 1          
Fair value          
Adjusted Cost 28,282,561   28,282,561   99,781,433
Unrealized Gains     12,652   258
Unrealized Losses         (19,040)
Fair Value 28,295,213   28,295,213   99,762,651
Level 1 | Cash and Cash Equivalents          
Fair value          
Fair Value 4,191,613   4,191,613   29,064,011
Level 1 | Marketable Securities.          
Fair value          
Fair Value 24,103,600   24,103,600   70,698,640
Level 1 | Money market funds          
Fair value          
Adjusted Cost 4,191,613   4,191,613   29,064,011
Fair Value 4,191,613   4,191,613   29,064,011
Level 1 | Money market funds | Cash and Cash Equivalents          
Fair value          
Fair Value 4,191,613   4,191,613   29,064,011
Level 1 | U.S. Treasury securities          
Fair value          
Adjusted Cost 24,090,948   24,090,948   70,717,422
Unrealized Gains     12,652   258
Unrealized Losses         (19,040)
Fair Value 24,103,600   24,103,600   70,698,640
Level 1 | U.S. Treasury securities | Marketable Securities.          
Fair value          
Fair Value 24,103,600   24,103,600   $ 70,698,640
Level 2          
Fair value          
Adjusted Cost 129,804,197   129,804,197    
Unrealized Gains     33,355    
Unrealized Losses     (3,607)    
Fair Value 129,833,945   129,833,945    
Level 2 | Cash and Cash Equivalents          
Fair value          
Fair Value 24,000,170   24,000,170    
Level 2 | Marketable Securities.          
Fair value          
Fair Value 105,833,775   105,833,775    
Level 2 | Repurchase agreements          
Fair value          
Adjusted Cost 23,000,000   23,000,000    
Fair Value 23,000,000   23,000,000    
Level 2 | Repurchase agreements | Cash and Cash Equivalents          
Fair value          
Fair Value 23,000,000   23,000,000    
Level 2 | U.S. agency securities          
Fair value          
Adjusted Cost 106,804,197   106,804,197    
Unrealized Gains     33,355    
Unrealized Losses     (3,607)    
Fair Value 106,833,945   106,833,945    
Level 2 | U.S. agency securities | Cash and Cash Equivalents          
Fair value          
Fair Value 1,000,170   1,000,170    
Level 2 | U.S. agency securities | Marketable Securities.          
Fair value          
Fair Value $ 105,833,775   $ 105,833,775