Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended			36 Months Ended	86 Months Ended
	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2012
Income taxes
Tax credit awards reported as other income	$ 250	$ 256	$ 362	$ 506	$ 362	$ 494	$ 1,362	$ 1,363
Federal | Qualifying Therapeutic Discovery Project
Income taxes
Tax credit awards reported as other income						244		244
New York | Biotechnology Tax Credit
Income taxes
Tax credit awards reported as other income				250	116	250		616
New York | QETC credit
Income taxes
Tax credit awards reported as other income				$ 256	$ 246			$ 502