Net Loss Per Share - Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net loss available to common stockholders	$ (4,314)	$ (770)	$ (11,300)	$ (2,011)
Denominator:
Weighted average shares outstanding - basic	12,209	11,540	11,826	11,494
Potential common shares - options (treasury stock method)	2		3	28
Weighted average shares outstanding - diluted	12,211	11,540	11,829	11,522
Shares excluded (anti-dilutive)	2		3	28
Shares excluded due to an exercise price greater than weighted average stock price for the period	2,062	510	2,062	380
Net loss per common share:
Basic	$ (0.35)	$ (0.07)	$ (0.96)	$ (0.17)
Diluted	$ (0.35)	$ (0.07)	$ (0.96)	$ (0.17)