Net Loss per Share - Schedule of Computation of Net Loss per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net loss	$ (155,900)	$ (133,964)
Denominator:
Weighted average number of shares outstanding—basic and diluted (shares)	158,781	151,651
Net loss per share—basic and diluted (usd per share)	$ (0.98)	$ (0.88)