Consolidated Statements of Comprehensive Loss (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Clinical treatment programs	$ 36us-gaap_SalesRevenueGoodsNet	$ 76us-gaap_SalesRevenueGoodsNet
Total revenues	36us-gaap_Revenues	76us-gaap_Revenues
Costs and expenses:
Production costs	372us-gaap_CostOfRevenue	323us-gaap_CostOfRevenue
Research and development	2,674us-gaap_ResearchAndDevelopmentExpense	2,326us-gaap_ResearchAndDevelopmentExpense
General and administrative	1,913us-gaap_GeneralAndAdministrativeExpense	2,539us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses	4,959us-gaap_CostsAndExpenses	5,188us-gaap_CostsAndExpenses
Operating loss	(4,923)us-gaap_OperatingIncomeLoss	(5,112)us-gaap_OperatingIncomeLoss
Interest expense	(2)	(3)
Interest and other income	106us-gaap_OtherInterestAndDividendIncome	153us-gaap_OtherInterestAndDividendIncome
Gain from sale of income tax net operating losses	1,374	1,126
Net loss	(3,445)us-gaap_ProfitLoss	(3,836)us-gaap_ProfitLoss
Other comprehensive income:
Unrealized gain on marketable securities	111us-gaap_UnrealizedGainLossOnInvestments	21us-gaap_UnrealizedGainLossOnInvestments
Net comprehensive loss	$ (3,334)	$ (3,815)
Basic and diluted loss per share (usd per share)	$ (0.02)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.02)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding, basic and diluted (shares)	213,634,004	176,730,956

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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