Summary of Significant Accounting Policies (Details 4) (USD $)	9 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jan. 31, 2010 Life Sciences Tax Incentive Program 2010	Sep. 30, 2012 Life Sciences Tax Incentive Program 2010	Sep. 30, 2011 Life Sciences Tax Incentive Program 2010	Sep. 30, 2012 Life Sciences Tax Incentive Program 2010	Sep. 30, 2011 Life Sciences Tax Incentive Program 2010	Dec. 31, 2010 Life Sciences Tax Incentive Program 2010 item	Jan. 31, 2011 Life Sciences Tax Incentive Program 2011	Sep. 30, 2012 Life Sciences Tax Incentive Program 2011	Jun. 30, 2011 Life Sciences Tax Incentive Program 2011 item	Sep. 30, 2012 Life Sciences Tax Incentive Program 2011
Other Income (Expense)
Tax incentive awarded				$ 1,500,000						$ 1,347,000
State research and development tax credits monetized									1,350,000			1,212,000
Number of employees pledged to be hired									50			50
Performance period									5 years			5 years
Amount of benefit recognized					67,000	67,000	203,000	203,000			424,000		424,000
Settlement from former service provider		1,800,000
Deferred Financing Costs
Deferred financing costs			1,946,000
Deferred financing costs netted against the equity proceeds within stockholders' equity	$ 2,748,000