Common Stock, Preferred Stock and Stockholders' Deficit (Details) (USD $)	0 Months Ended	6 Months Ended	12 Months Ended
	Jun. 13, 2013	Jun. 30, 2013 item	Dec. 31, 2012 item
Common Stock, Preferred Stock and Stockholders' Deficit
Reverse stock split ratio	0.67	0.67
Common Stock
Number of classes of common stock		2	2
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Common stock, shares authorized		102,333,333	52,333,333
Common stock, shares outstanding		7,791,053	7,722,262
Common stock
Common Stock
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Common stock, shares authorized		100,000,000	50,000,000
Common stock, shares outstanding		6,738,589	6,674,905
Number of votes entitled per share		1
Series II common stock
Common Stock
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Common stock, shares authorized		2,333,333	2,333,333
Common stock, shares outstanding		1,052,464	1,047,357
Number of votes entitled per share		1