Stock-based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 324,000	$ 470,000	$ 783,000	$ 1,025,000
Total remaining unrecognized compensation cost related to non-vested stock options	4,400,000		4,400,000
Total remaining unrecognized compensation cost related to non-vested stock options, recogniztion period			3 years 4 months 13 days
Stock awards granted	125,000		175,000	120,000
Risk-free interest rate				0.95%
Expected option life				6 years
Expected dividend yield			0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum				42.01%
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	26,000	59,000	80,000	141,000
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	24,000	35,000	49,000	67,000
Selling General And Administrative Stock Based Compensation Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 274,000	$ 376,000	$ 654,000	$ 817,000
Minimum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Risk-free interest rate			0.65%
Expected option life			4 years 2 months 12 days
Expected price volatility			40.20%
Maximum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Risk-free interest rate			1.16%
Expected option life			6 years
Expected price volatility			41.67%