Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Stock-based compensation expense	$ 432	$ 386	$ 1,006	$ 918
Cost of Sales [Member]
Stock-based compensation expense	(5)	(14)	2	(8)
Research and Development Expense [Member]
Stock-based compensation expense	46	78	199	198
Selling and Marketing Expense [Member]
Stock-based compensation expense	45	39	172	150
General and Administrative Expense [Member]
Stock-based compensation expense	$ 346	$ 283	$ 633	$ 578