Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	$ 1,183,000	$ 1,165,000	$ 2,541,000	$ 1,867,000
Unrecognized compensation expense	7,600,000		7,600,000
Average vesting period, years			2 years 6 months
Stock-based compensation			2,541,000	1,867,000
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	8,000	14,000	22,000	33,000
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	149,000	156,000	346,000	311,000
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	1,026,000	995,000	2,173,000	1,523,000
Carl Pelzel [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation				$ 400,000