Subsequent Events (Details) (USD $)	6 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended
	Jun. 30, 2012 D	Jul. 27, 2012	Jun. 30, 2012 Oxford/SVB [Member]	Jun. 30, 2012 Oxford/SVB [Member] Term Loan [Member]	Dec. 31, 2011 Oxford/SVB [Member] Term Loan [Member]	Jun. 30, 2012 Oxford/SVB [Member] Revolving credit facility [Member]	Dec. 31, 2011 Oxford/SVB [Member] Revolving credit facility [Member]
Subsequent Events (Textual) [Abstract]
Common stock and warrants for net proceeds		$ 65,510,000
Sale of common stock , shares	32,500,000
Per share value of common stock	$ 1.99
Commons stock call by warrants	$ 0.01
Common stock call by warrants	14,625,000
Number of common stock per unit	$ 1
Number of warrant per unit	$ 0.45
Warrants exercisable period , Beginning	1 year
Warrants expiration period	5 years
Warrants exercise price	$ 2.50
Underwriter common stock grant period	30
Underwriter's common stock purchase option	14,625,000
Underwriter warrant purchase option	2,193,750
Underwriters exercised option shares of common stock	2,558,300
Underwriters exercised option shares of warrants	1,151,235
Term loan				25,000,000
Revolving credit facility						10,000,000
Interest rate				12.06%		7.29%
Revolving credit facility accrue interest payable monthly at a floating rate	greater of 3.29% above SVB’s prime rate
Fees for unused portion of revolving credit facility						0.50%
Outstanding balance of the term loan				20,300,000	25,000,000
Outstanding balance of the revolving credit facility						4,700,000	5,100,000
Outstanding Principal and interest			19,500,000
Final payment on loan agreement			1,200,000
Prepayment premium			400,000			100,000
Outstanding principal and interest, percentage			2.00%
Discounts and commissions	4,207,000
Offering expenses	$ 400,000