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3. Fair Value Measurement (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Bank deposits $ 644,355 $ 972,891
Money market funds 3,252,050 1,565,867
Cash and cash equivalents 3,896,405 2,538,758
Corporate debt securities 2,956,428 6,799,702
Commercial paper 6,852,833 599,934
Short term investments 0 7,399,636
Assets measured at fair value 0 9,938,394
Level 1    
Bank deposits 644,355 972,891
Money market funds 3,252,050 1,565,867
Cash and cash equivalents 3,896,405 2,538,758
Corporate debt securities 2,956,428 6,799,702
Commercial paper 6,852,833 599,934
Short term investments 0 7,399,636
Assets measured at fair value 0 9,938,394
Level 2    
Bank deposits 0 0
Money market funds 0 0
Cash and cash equivalents 0 0
Corporate debt securities 0 0
Commercial paper 0 0
Short term investments 0 0
Assets measured at fair value $ 0 $ 0