Equity-Based Compensation (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Equity-based compensation expense
Total equity-based compensation expense	$ 2,277	$ 1,939	$ 4,207	$ 4,221
Cost Of Sales [Member]
Equity-based compensation expense
Total equity-based compensation expense	29	35	57	58
Research And Development Expense [Member]
Equity-based compensation expense
Total equity-based compensation expense	359	365	808	1,297
Selling General And Administrative Expenses [Member]
Equity-based compensation expense
Total equity-based compensation expense	$ 1,889	$ 1,539	$ 3,342	$ 2,866