Related Party Transactions (Details) (USD $)		2 Months Ended	1 Months Ended		12 Months Ended		1 Months Ended		2 Months Ended	1 Months Ended
	Dec. 31, 2012	Feb. 29, 2012 Public offering	Apr. 30, 2011 Issuer-directed registered direct offering	Dec. 31, 2012 Registered Direct Offering	Dec. 31, 2011 Scientific founder and a member of the board of directors	Dec. 31, 2010 Scientific founder and a member of the board of directors	Apr. 30, 2011 Directors and entities affiliated with the directors Issuer-directed registered direct offering	Jan. 31, 2012 Director who is largest shareholder Public offering	Feb. 29, 2012 Director who is largest shareholder Public offering	Dec. 31, 2012 Directors, including the largest stockholder Registered Direct Offering	Jul. 31, 2012 Directors, including the largest stockholder Registered Direct Offering	Nov. 30, 2012 Officer	Jan. 31, 2013 Director
Related Party Transactions
Consulting fees paid					$ 120,000	$ 120,000
Shares sold by the entity		8,050,000	7,191,731	7,000,000			1,581,493	1,136,363	1,136,363	2,649,535	3,976,702
Selling price per share (in dollars per share)	$ 9.02	$ 4.40	$ 4.89	$ 8.60			$ 4.89	$ 4.40		$ 8.60	$ 6.49
Number of shares purchased and retired upon the vesting of restricted common stock in order to fund the related tax liability												3,969
Aggregate number of shares of common stock options exercised													114,250
Proceeds resulting from exercise of stock options													$ 1,000,000