Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Balance Sheets [Abstract]
Property and Equipment accumulated depreciation and amortization	$ 15,982	$ 15,765
Patent Costs accumulated amortization	$ 2,298	$ 2,199
Preferred stock, par or stated value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par or stated value	$ 0.0001	$ 0.0001
Common stock, shares authorized	300,000,000	200,000,000
Common stock, shares issued	135,743,787	135,743,120
Common stock, shares outstanding	135,743,787	135,743,120