CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets
Accounts receivable, allowances for doubtful accounts	$ 124,000	$ 561,000
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	2,000	2,000
Preferred stock, shares issued (in shares)	883	883
Preferred stock, shares outstanding (in shares)	883	883
Preferred stock, liquidation prefernce	$ 5,800,000	$ 5,600,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	70,000	70,000
Common stock, shares issued (in shares)	32,222	31,877
Common stock, shares outstanding (in shares)	32,222	31,877