Organization and Description of the Business (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Organization and Description of the Business [Abstract]
Retained earnings (accumulated deficit)	$ (365,730,000)	$ (362,006,000)
Proceeds from issuance of private placement, gross	13,000,000
Net proceeds from March 2015 financing	$ 12,400,000