Loan and Security Agreement (Details) (USD $)		6 Months Ended	1 Months Ended	6 Months Ended		1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 First Advance Line of Credit Facility [Member] Warrants [Member] Warrants	Jun. 30, 2010 Restated Agreement [Member]	Jun. 30, 2012 Restated Agreement [Member] Warrants [Member] Warrants	Jun. 30, 2010 Restated Agreement [Member] Warrants [Member]	Dec. 31, 2011 Second Amended Agreement [Member]	Jun. 30, 2012 Second Amended Agreement [Member]	Jun. 30, 2012 Second Amended Agreement [Member] Warrants [Member] Warrants
Loan and Security Agreement (Textual) [Abstract]
Growth capital loan facility						$ 3,434,000
Fees and expenses paid in connection with closing of the credit facility						63,000
Fixed interest rate						10.99%
Payment for termination of loan						954,000
Payment for termination of loan, percentage						6.00%
Risk free interest rates		3.64%		2.70%				1.40%
Expected dividend yield		0.00%		0.00%				0.00%
Expected volatility		70.00%		76.50%				72.40%
Contractual term		7 years		7 years				7 years
Number of aggregate shares underlying warrants		50,331			254,793			158,311
Fair value of Common stock warrants under Black-Scholes valuation model		474,000		1,237,000				390,000
Exercise price of common shares	0.125	12.67		7.0645				3.79
Warrants Expiration Date		Nov. 30, 2014		Jun. 18, 2017				Dec. 22, 2018
Issued exercisable warrants related to credit facility		6		3				4
Loan using an effective interest rate							15.31%
Payment of Line of Credit Facility			15,000,000
Payment for termination of Loan			375,000
Amortization of financing costs			145,000
Principal balance of the Restated Agreement			$ 30,000,000
Length of time for payments to be made of principal and interest under second amended agreement							30 months