Liquidity and Capital Resources (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Estimated projected expenditure [Line Items]
Cash and cash equivalents	$ 62,028,328	$ 11,483,112	$ 11,429,671	$ 14,344,088
Short-term investments	50,584,980	27,084,980
Currently projected expenditures for clinical programs	43,200,000
Aldoxorubicin [Member]
Estimated projected expenditure [Line Items]
Currently projected expenditures for clinical programs	29,200,000
Other Programs [Member]
Estimated projected expenditure [Line Items]
Currently projected expenditures for clinical programs	1,900,000
General Operation [Member]
Estimated projected expenditure [Line Items]
Currently projected expenditures for clinical programs	4,300,000
Other General and Administrative Expenses [Member]
Estimated projected expenditure [Line Items]
Currently projected expenditures for clinical programs	$ 7,800,000