Subordinated Convertible Term Notes (Details) (USD $)	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Oct. 22, 2012 Subordinated convertible term notes	Dec. 31, 2012 Subordinated convertible term notes	Dec. 31, 2012 Subordinated convertible term notes Conversion features from issuance of debt to the first anniversary	Dec. 31, 2012 Subordinated convertible term notes Conversion features from issuance of debt to the first anniversary Minimum	Dec. 31, 2012 Subordinated convertible term notes Conversion features from first anniversary until maturity of debt	Dec. 31, 2012 Subordinated convertible term notes Conversion features from first anniversary until maturity of debt Minimum
Subordinated Convertible Term Notes
Amount lent under purchase agreement			$ 6,050,000
Term of the debt instrument				5 years
Interest rate (as a percent)				12.50%
Conversion price (in dollars per share)			$ 0.64	$ 0.7325
Percentage of the conversion price that weighted average price of the entity's common stock must exceed in order for the notes to be convertible						200.00%		175.00%
Number of days within 30 consecutive trading days in which the weighted average price of the entity's common stock must exceed the conversion price for the notes to be redeemable						20 days		20 days
Number of consecutive trading days used to determine the conversion obligation on the notes					30 days		30 days
Number of trading days prior to forced conversion notice					5 days		5 days
Period after issuance of note that the entity will need to keep sufficient authorized shares in order to avoid a trigger event				60 days
Percentage of change of control premium at which the notes are redeemable for the period from the issuance date through the second anniversary				130.00%
Percentage of change of control premium at which the notes are redeemable for the period from the second anniversary through the fourth anniversary				120.00%
Percentage of change of control premium at which the notes are redeemable for the period after the fourth anniversary				100.00%
Warrant issued to purchase shares of common stock (in shares)			4,514,927
Exercise price of warrant to purchase shares of common stock (in dollars per share)			$ 0.67
Warrant term			5 years
Fair value of warrant at date of issuance			1,400,000
Percentage of issued and outstanding shares that is not to be exceeded upon the conversion the notes and warrants				20.00%
Value allocated to the Notes			4,924,000
Number of shares of common stock into which the term notes are convertible			8,259,386
If-converted value of the Notes			5,286,000
Difference between the market value of the shares issuable upon conversion and the value allocated to the notes			362,000
Amortization of the discount	50,000			50,000
Costs incurred related to issuance of the notes				37,000
Amortization of deferred issuance costs	57,000	32,000		2,000
Accrued interest of note				$ 137,000