Stockholders' Equity (Details 3) - Income Statement Location [Domain]	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) shares	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) employee shares	Jun. 30, 2014 USD ($)
Share-based compensation expense related to outstanding awards
Share-based compensation expense | $			$ 281,814,000
Employee Stock Purchase Plan (ESPP)
Share-based compensation expense related to outstanding awards
Common stock issued in connection with ESPP (in shares)			20,214
Common stock issued in connection with ESPP, Amount | $			$ 1,900,000
Maximum percentage of compensation employees may contribute for ESPP	15.00%		15.00%
Percentage of the lower of the fair market value of common stock on the first or last trading-day of a given offering period			85.00%
Number of eligible employees who may purchase more than four thousand shares during offering period | employee			0
Maximum number of shares each eligible employees may purchase in any given offering period			4,000
Term of employee stock purchase plan			20 years
Maximum number of shares authorized to be issued	3,000,000		3,000,000
Share-based compensation expense | $	$ 249,900	$ 276,500	$ 560,600	$ 507,500