Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Consolidated Balance Sheets [Abstract]
Accounts receivable, net of allowance for doubtful accounts	$ 330	$ 285
Preferred stock, par value	$ 0.000001	$ 0.000001
Preferred stock, shares authorized	25,000	25,000
Preferred stock, shares issued
Common stock, par value	$ 0.000001	$ 0.000001
Common stock, shares authorized	120,000	120,000
Common stock, shares issued	55,530	55,281
Common stock, shares outstanding	55,530	55,281