Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowances for sales returns and uncollectible accounts receivable	$ 422	$ 406
Stockholders' equity:
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	175,000	175,000
Common stock, shares issued	47,174	45,179
Common stock, shares outstanding	45,186	45,179
Treasury stock, at cost	1,988	0