STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Research contract revenue	$ 272us-gaap_ContractsRevenue	$ 200us-gaap_ContractsRevenue
Operating expenses:
Research and development, including costs of research contracts	74,249us-gaap_ResearchAndDevelopmentExpense	6,542us-gaap_ResearchAndDevelopmentExpense
General and administrative	4,250us-gaap_GeneralAndAdministrativeExpense	3,442us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	78,499us-gaap_OperatingCostsAndExpenses	9,984us-gaap_OperatingCostsAndExpenses
Loss from operations	(78,227)us-gaap_OperatingIncomeLoss	(9,784)us-gaap_OperatingIncomeLoss
Other income (expense), net	(4)us-gaap_OtherNonoperatingIncomeExpense	(9)us-gaap_OtherNonoperatingIncomeExpense
Change in fair value of warrants		82us-gaap_UnrealizedGainLossOnDerivatives
Net loss	$ (78,231)us-gaap_NetIncomeLoss	$ (9,711)us-gaap_NetIncomeLoss
Net loss per share-basic and diluted	$ (0.69)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.10)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding used to compute net loss per share-basic and diluted	113,410,250	100,229,200

Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

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