Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Summary of Significant Accounting Policies [Line Items]
Effective tax rate	1.00%	(5.00%)
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Vesting period of equity awards	2 years
Useful life of patents and patent rights	1 year
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Vesting period of equity awards	4 years
Useful life of patents and patent rights	9 years