Subsequent Events (Details) (USD $)	9 Months Ended		0 Months Ended				0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Oct. 31, 2014 Subsequent Event [Member]	Oct. 08, 2014 Subsequent Event [Member] Director	Oct. 03, 2014 Subsequent Event [Member]	Oct. 01, 2014 Subsequent Event [Member] Asterias [Member]	Oct. 08, 2014 Subsequent Event [Member] Broadwood Partners, LP [Member]
Subsequent Event [Line Items]
Warrants distribution (in shares)						8,000,000
Number of shares sold (in shares)			9,431,398		504,600
Stock issued during period (in shares)				9,431,398			4,040,523
Market value of common shares (in dollars per share)			$ 3.12		$ 3.12
Proceeds from issuance of common stock	$ 0	$ 23,810,421	$ 29,425,962	$ 29,425,962	$ 1,574,352
Number of directors				3
Shares purchased by directors (in shares)				96,150