Computation of Basic and Diluted Loss Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Numerator
Basic and diluted net loss	$ (2,190)	$ (1,568)	$ (1,235)	$ (2,962)	$ (1,098)	$ (1,453)	$ (2,835)	$ (735)	$ (7,955)	$ (6,121)
Denominator
Basic and diluted earnings per share - weighted average shares outstanding	1,451,140	1,360,107	1,256,915	970,887	786,579	797,751	789,738	784,327	1,265,270	786,579
Basic and diluted loss per common share	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ (0.01)