Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accumulated depreciation on property and equipment	$ 19,442,000	$ 19,748,000
Accumulated amortization on patents, licenses and purchased technology	$ 2,362,000	$ 2,342,000
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	564,642	564,642
Preferred stock, shares outstanding	564,642	564,642
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	40,268,376	33,362,281
Common stock, shares outstanding	40,268,376	33,362,281