Subsequent Events (Details) (USD $)	12 Months Ended			86 Months Ended			3 Months Ended	0 Months Ended	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Oct. 15, 2012 Callisto Merger Agreement	Oct. 14, 2012 Callisto Merger Agreement	Dec. 31, 2012 June 21, 2012 Equity sales agreement	Jan. 17, 2013 Subsequent Event Callisto Merger Agreement	Mar. 18, 2013 Subsequent Event June 21, 2012 Equity sales agreement
Subsequent Events
Exchange Ratio of shares					0.1799	0.17		0.1799
Cancellation of common stock (in shares)								22,295,000
Number of shares issued as part of the merger								28,605,354
Lock-up period for common stock issued in acquisition								24 months
Net liabilities assumed								$ 1,700,000
Common stock issued via private placements (in shares)							815,654		758,093
Gross proceeds from sale of common stock by the entity	55,862,000	34,369,000	7,179,000	116,406,000			4,111,802		4,670,861
Common stock, average selling price (in dollars per share)							$ 5.04		$ 6.16
Selling agent fees	$ 3,774,000	$ 2,148,000	$ 468,000	$ 6,724,000					$ 140,126