Liquidity and Capital Resources (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Estimated projected expenditure [Line Items]
Cash and cash equivalents	$ 51,866,891	$ 11,483,112	$ 10,980,486	$ 14,344,088
Short-term investments	50,601,506	27,084,980
Currently projected expenditures for clinical programs	56,400,000
Aldoxorubicin [Member]
Estimated projected expenditure [Line Items]
Currently projected expenditures for clinical programs	42,500,000
Other Programs [Member]
Estimated projected expenditure [Line Items]
Currently projected expenditures for clinical programs	2,100,000
General Operation [Member]
Estimated projected expenditure [Line Items]
Currently projected expenditures for clinical programs	3,900,000
Other General and Administrative Expenses [Member]
Estimated projected expenditure [Line Items]
Currently projected expenditures for clinical programs	$ 7,900,000