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3. Fair Value Measurement (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Bank deposits $ 440,809 $ 972,891
Money market funds 1,732,449 1,565,867
Cash and cash equivalents 2,173,258 2,538,758
Corporate debt securities 1,401,453 6,799,702
Commercial paper 249,888 599,934
Short term investments 1,651,341 7,399,636
Total 3,824,599 9,938,394
Level 1    
Bank deposits 440,809 972,891
Money market funds 1,732,449 1,565,867
Cash and cash equivalents 2,173,258 2,538,758
Corporate debt securities 1,401,453 6,799,702
Commercial paper 249,888 599,934
Short term investments 1,651,341 7,399,636
Total 3,824,599 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
Total $ 0 $ 0