3. Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Measurement Tables

Schedule of fair value measurements

As of June 30, 2015	Level 1		Level 2		Total
Bank deposits	$	644,355	$	—	$	644,355
Money market funds	3,252,050		—		3,252,050
Cash and cash equivalents	3,896,405		—		3,896,405
Corporate debt securities	2,956,428		—		2,956,428
Total	$	6,852,833	$	—	$	6,852,833

As of December 31, 2014	Level 1		Level 2		Total
Bank deposits	$	972,891	$	—	$	972,891
Money market funds	1,565,867		—		1,565,867
Cash and cash equivalents	2,538,758		—		2,538,758
Corporate debt securities	6,799,702		—		6,799,702
Commercial paper	599,934		—		599,934
Short term investments	7,399,636		—		7,399,636
Total	$	9,938,394	$	—	$	9,938,394