Net Loss per Share - Schedule of Computation of Net Loss per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net loss	$ (539,215)	$ (443,790)	$ (120,635)
Denominator:
Weighted average number of shares outstanding—basic and diluted (in shares)	154,120	142,176	45,271
Net loss per share—basic and diluted (usd per share)	$ (3.50)	$ (3.12)	$ (2.66)