Net Loss Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net loss	$ (18,524)	$ (17,291)
Common shares outstanding:
Historical common shares outstanding at beginning of period	43,303,298	42,632,771
Weighted average common shares issued	187,885	64,552
Weighted average common shares outstanding — basic and diluted	43,491,183	42,697,323
Net loss per share — basic and diluted (in dollars per share)	$ (0.43)	$ (0.40)