Subsequent Events (Details) (USD $)	12 Months Ended	1 Months Ended		12 Months Ended
	Dec. 31, 2012 2011 Plan	Feb. 28, 2013 Subsequent events 2011 Plan	Jan. 31, 2013 Subsequent events Life Sciences Tax Incentive Program 2013	Dec. 31, 2012 Subsequent events Life Sciences Tax Incentive Program 2013 item
Subsequent event
Tax incentive awarded			$ 500,000
State research and development tax credits monetized			$ 400,000
Number of incremental employees pledged to be hired				20
Additional shares of common stock registered (in shares)	3,500,000	3,353,882