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Fair Value Measurement (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Bank deposits $ 1,264,989 $ 440,809
Money market funds 53,480 1,732,449
Cash and cash equivalents 1,318,469 2,173,258
Corporate debt securities   1,401,453
Commercial paper   249,888
Short term investments   1,651,341
Total 1,318,469 3,824,599
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Bank deposits 1,264,989 440,809
Money market funds 53,480 1,732,449
Cash and cash equivalents 1,318,469 2,173,258
Corporate debt securities   1,401,453
Commercial paper   249,888
Short term investments   1,651,341
Total 1,318,469 3,824,599
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Bank deposits 0 0
Money market funds 0 0
Cash and cash equivalents 0 0
Corporate debt securities   0
Commercial paper   0
Short term investments   0
Total $ 0 $ 0