Computation of Diluted Loss Per Share with Exclusion of Antidilutive Securities (Detail) (USD $) In Thousands, 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
Numerator:
Net loss	$ (1,154)	$ 582	$ 787	$ (738)	$ (1,282)	$ 487	$ 1,097	$ (939)	$ (523)	$ (637)	$ (2,014)
Denominator:
Weighted average shares outstanding									4,906	4,691	4,597
Dilutive effect of stock options and restricted shares									0	0	0
Denominator for diluted loss per share									4,906	4,691	4,597