Earnings Per Share - Schedule of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net loss	$ (2,462)	$ (1,684)
Denominator:
Weighted-average shares outstanding – basic (in shares)	51,830	53,716
Effect of dilutive securities:
Employee and director stock options and restricted common shares (in shares)	0	0
Weighted-average shares outstanding – diluted (in shares)	51,830	53,716
Basic earnings per share (in dollars per share)	$ (0.05)	$ (0.03)
Diluted earnings per share (in dollars per share)	$ (0.05)	$ (0.03)