Fair Value Measurement (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank deposits	$ 1,352,541	$ 440,809
Money market funds	53,285	1,732,449
Cash and cash equivalents	1,405,826	2,173,258
Corporate debt securities		1,401,453
Commercial paper		249,888
Short term investments		1,651,341
Total	1,405,826	3,824,599
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank deposits	1,352,541	440,809
Money market funds	53,285	1,732,449
Cash and cash equivalents	1,405,826	2,173,258
Corporate debt securities		1,401,453
Commercial paper		249,888
Short term investments		1,651,341
Total	1,405,826	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