Shareholders' Equity (Details) (USD $)	0 Months Ended	9 Months Ended			0 Months Ended					9 Months Ended
	Jul. 22, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	May 02, 2013 Warrant	Sep. 30, 2013 Warrant	Jun. 29, 2012 Warrant	Sep. 30, 2013 Stock options	Sep. 30, 2013 Restricted stock units	Sep. 30, 2013 Common Stock
Shareholders' Equity
Common stock, authorized shares		500,000,000		500,000,000
Common stock, par value (in dollars per share)		$ 0.01		$ 0.01
Common stock, issued shares		39,100,899		31,488,204
Common stock, outstanding shares		39,100,899		31,488,204
Common stock disclosures
Holdback shares retained as security for indemnification payments										1,765,271
Common stock shares reserved for issuance								3,438,621	105,544
Number of shares issued under underwritten public offering	6,900,000
Number of share's exercise in full of over-allotment option by underwriter	900,000
Shares price (in dollars per share)	$ 10.40
Net proceeds from the sale of shares	$ 67,017,000	$ 67,017,000	$ 25,659,000
Underwriter's discount and offering expenses	4,700,000
Warrant disclosures
Warrant to purchase common stock, number of shares						0	329,932
Exercise price of warrants (in dollars per share)							$ 2.94
Fair value of warrant					$ 800,000
Warrant Shares issued and delivered					223,431
Warrant Shares outstanding						0