Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 30,573	$ 39,904
Accounts receivable	5,135	3,633
Other current assets	1,924	1,647
Total Current Assets	37,632	45,184
Property and Equipment, net of accumulated depreciation and amortization of $15,982 and $15,765	4,105	4,265
Patent Costs, net of accumulated amortization of $2,298 and $2,199	4,704	4,764
Other assets	206	155
Total Assets	46,647	54,368
Liabilities and Shareholders' Equity
Accounts payable	8,195	9,396
Accrued employee compensation	1,852	2,244
Long-term debt, current portion	86	85
Warrant valuation	16,372	5,446
Deferred revenue	3,304	3,304
Other liabilities	114	126
Total Current Liabilities	29,923	20,601
Commitments and Contingencies
Long-term debt, non-current portion	1,735	1,757
Other long-term liabilities	967	993
Shareholders' Equity:
Preferred stock, $.0001 par value, 20,000,000 shares authorized; none issued and outstanding	0	0
Common stock, $.0001 par value, 300,000,000 and 200,000,000 shares authorized; 135,743,787 and 135,743,120 issued and outstanding	13	13
Additional paid-in capital	341,677	340,968
Deficit accumulated during the development stage	(327,668)	(309,964)
Total Shareholders' Equity	14,022	31,017
Total Liabilities and Shareholders' Equity	$ 46,647	$ 54,368