Net Loss Per Share - Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net loss available to common stockholders	$ (3,280)	$ (1,231)	$ (6,986)	$ (1,241)
Denominator:
Weighted average shares outstanding-basic	46,964	46,257	46,529	45,881
Potential common shares-options (treasury stock method)	0	0	0	0
Weighted average shares outstanding-diluted	46,964	46,257	46,529	45,881
Shares excluded (anti-dilutive)		134		164
Shares excluded due to an exercise price greater than weighted average stock price for the period	1,470	1,534	1,470	1,489
Net loss per common share:
Basic	$ (0.07)	$ (0.03)	$ (0.15)	$ (0.03)
Diluted	$ (0.07)	$ (0.03)	$ (0.15)	$ (0.03)