Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Allowance for doubtful accounts	$ 126	$ 117
Stockholders' equity:
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	47,000,000	47,000,000
Common stock, shares issued	23,437,033	23,182,771
Common stock, shares outstanding	23,437,033	23,182,771
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0