Net Loss Per Share - Schedule of Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net loss	$ (5,208)	$ (24,558)	$ (7,479)	$ (16,349)	$ (2,603)	$ (3,090)	$ (1,294)	$ (2)	$ (53,594)	$ (6,989)	$ (413)
Basic and diluted weighted average shares outstanding	177,414,574	175,401,867	111,819,848	37,602,790	11,456,997	7,023,704	2,755,487	439,097	126,079,369	5,453,404	64,252
Basic and diluted net loss per share	$ (0.03)	$ (0.14)	$ (0.07)	$ (0.43)	$ (0.23)	$ (0.44)	$ (0.47)	$ 0.00	$ (0.43)	$ (1.28)	$ (6.43)