Significant Accounting Policies (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Equipment, Furniture, Leasehold Improvements and Long-Lived Assets
Reserve for warranty and preventative maintenance costs	$ 0	$ 0
Revenue Recognition
Deferred revenue	317,000	277,000
Deferred revenue recognized	381,000	0
Deferred cost of goods sold	$ 85,000	$ 115,000
Loss Per Share
Outstanding warrants, convertible notes, and stock options excluded from the calculation of diluted loss per share because the effect would have been antidilutive (in shares)	47,096,000	46,162,000
Equipment | Minimum
Equipment, Furniture, Leasehold Improvements and Long-Lived Assets
Useful lives	2 years
Equipment | Maximum
Equipment, Furniture, Leasehold Improvements and Long-Lived Assets
Useful lives	5 years
Office furniture and fixtures
Equipment, Furniture, Leasehold Improvements and Long-Lived Assets
Useful lives	5 years