Stock-Based Compensation (Details 2) (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 included in unaudited results of operations
Total stock option/warrant expense, included in total operating expenses	$ 35	$ 57	$ 92	$ 117
Officer compensation [Member]
Stock-based compensation included in unaudited results of operations
Total stock option/warrant expense, included in total operating expenses	15	16	31	32
Non-employee directors [Member]
Stock-based compensation included in unaudited results of operations
Total stock option/warrant expense, included in total operating expenses	4	5	9	10
Sales, general and administrative [Member]
Stock-based compensation included in unaudited results of operations
Total stock option/warrant expense, included in total operating expenses	6	6	12	15
Research and development [Member]
Stock-based compensation included in unaudited results of operations
Total stock option/warrant expense, included in total operating expenses	$ 10	$ 30	$ 40	$ 60