Description of Business and Basis of Presentation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of computation of basic and diluted net income (loss) per share
Net loss	$ (278)	$ (952)
Effect of assumed conversion of convertible debentures
Weighted-average common shares outstanding	28,825	28,122
Weighted-average common shares outstanding, assuming dilution	28,825	28,122
Net loss per share
Basic	$ (0.01)	$ (0.03)
Diluted	$ (0.01)	$ (0.03)
Options to purchase common stock
Effect of assumed conversion of convertible debentures
Effect of potentially dilutive securities	0	0
Restricted stock awards
Effect of assumed conversion of convertible debentures
Effect of potentially dilutive securities	0	0
Restricted stock unit awards
Effect of assumed conversion of convertible debentures
Effect of potentially dilutive securities	0	0
Employee stock purchase plan
Effect of assumed conversion of convertible debentures
Effect of potentially dilutive securities	0	0