CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Amortization of upfront incentive consideration	$ 10,388	$ 9,385	$ 33,177	$ 28,736
Stock-based compensation expense			22,434	5,446
Cost of revenue [Member]
Stock-based compensation expense	2,172	544	5,618	816
Selling, general and administrative [Member]
Stock-based compensation expense	$ 3,300	$ 2,142	$ 16,816	$ 4,630