Stock Option and Compensation Plans (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other information
Share-based compensation expense	$ 7,041	$ 3,580	$ 18,474	$ 9,492
Stock options
Other information
Share-based compensation expense	3,400	3,100	11,400	8,300
Unrecognized share-based compensation costs for option awards, net of estimated forfeitures	41,200		$ 41,200
Expected weighted average period to recognize share-based compensation costs			2 years 9 months 18 days
Non-employee Options | Consultants
Other information
Share-based compensation expense	1,800	400	$ 3,400	1,000
Unrecognized share-based compensation costs for option awards, net of estimated forfeitures	$ 2,400		$ 2,400
Expected weighted average period to recognize share-based compensation costs			2 years 3 months 18 days
Restricted stock units
Other information
Units outstanding	285,000		285,000
Restricted stock units | Employees
Other information
Share-based compensation expense	$ 1,800	$ 100	$ 3,700	$ 200
Expected weighted average period to recognize share-based compensation costs			2 years 9 months 18 days
Unrecognized share-based compensation costs, net of estimated forfeitures	$ 8,800		$ 8,800