Earnings Per Share - Earnings Per Basic and Diluted Share Table (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator
Net loss	$ (7,826)	$ (8,981)
Denominator
Weighted-average common shares outstanding (in shares)	46,262	34,172
Basic and diluted net loss per share (dollars per share)	$ (0.17)	$ (0.26)