Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Allowances for doubtful accounts receivable	$ 1,121	$ 1,382
Reserves for excess and obsolete inventory	$ 436	$ 417
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common Stock, Shares Authorized	50,000,000	50,000,000
Common stock, shares issued	36,123,317	35,611,976
Common stock, shares outstanding	36,123,317	35,611,976