Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net loss available for common shareholders - basic and diluted	$ (5,647)	$ (3,556)
Denominator:
Weighted-average shares outstanding - basic and diluted	68,113	47,566
Net loss per share - basic and diluted	$ (0.08)	$ (0.07)