STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Costs and expenses:
Research and development	$ 1,707us-gaap_ResearchAndDevelopmentExpense	$ 1,308us-gaap_ResearchAndDevelopmentExpense
General and administrative	1,037us-gaap_GeneralAndAdministrativeExpense	1,082us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses	2,744us-gaap_CostsAndExpenses	2,390us-gaap_CostsAndExpenses
Loss from operations	(2,744)us-gaap_OperatingIncomeLoss	(2,390)us-gaap_OperatingIncomeLoss
Interest and other income	1us-gaap_InterestAndOtherIncome	2us-gaap_InterestAndOtherIncome
Interest expense	(1)us-gaap_InterestExpense	(1)us-gaap_InterestExpense
Net loss and comprehensive loss	$ (2,744)us-gaap_NetIncomeLoss	$ (2,389)us-gaap_NetIncomeLoss
Net loss per share:
Basic and diluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding:
Basic and diluted	21,167,523	18,785,418

Total costs of sales and operating expenses for the period.

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