Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 24,491	$ 39,904
Accounts receivable	7,180	3,633
Other current assets	1,561	1,647
Total Current Assets	33,232	45,184
Property and Equipment, net of accumulated depreciation and amortization of $16,208 and $15,765	3,898	4,265
Patent Costs, net of accumulated amortization of $2,413 and $2,199	4,740	4,764
Other assets	231	155
Total Assets	42,101	54,368
Current Liabilities:
Accounts payable	8,813	9,396
Accrued employee compensation	1,936	2,244
Long-term debt, current portion	87	85
Warrant valuation	2,884	5,446
Deferred revenue	3,304	3,304
Other liabilities	107	126
Total Current Liabilities	17,131	20,601
Commitments and Contingencies	0	0
Long-term debt, non-current portion	1,713	1,757
Other long-term liabilities	757	993
Shareholders' Equity:
Preferred stock, $.0001 par value, 3,333,333 shares authorized; none issued and outstanding	0	0
Common stock, $.0001 par value, 50,000,000 shares authorized; 22,623,965 and 22,623,853 issued and outstanding	2	2
Additional paid-in capital	342,128	340,979
Deficit accumulated during the development stage	(319,630)	(309,964)
Total Shareholders' Equity	22,500	31,017
Total Liabilities and Shareholders' Equity	$ 42,101	$ 54,368