Consolidated Statements of Operations and Comprehensive Loss (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Sales		$ 93us-gaap_SalesRevenueNet
Operating Expenses
Cost of goods sold		220us-gaap_CostOfGoodsSold
Research and development	7,484us-gaap_ResearchAndDevelopmentExpense	5,011us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	375us-gaap_SellingAndMarketingExpense	406us-gaap_SellingAndMarketingExpense
General and administrative	1,980us-gaap_GeneralAndAdministrativeExpense	1,614us-gaap_GeneralAndAdministrativeExpense
Total Operating Expenses	9,839us-gaap_CostsAndExpenses	7,251us-gaap_CostsAndExpenses
Operating Loss	(9,839)us-gaap_OperatingIncomeLoss	(7,158)us-gaap_OperatingIncomeLoss
Other Expense
Interest expense, net	(281)us-gaap_InterestExpense	(321)us-gaap_InterestExpense
Total Other Expense, net	(281)us-gaap_NonoperatingIncomeExpense	(321)us-gaap_NonoperatingIncomeExpense
Net Loss	(10,120)us-gaap_NetIncomeLoss	(7,479)us-gaap_NetIncomeLoss
Other comprehensive income (loss)	0us-gaap_OtherComprehensiveIncomeLossTax	0us-gaap_OtherComprehensiveIncomeLossTax
Comprehensive loss	$ (10,120)	$ (7,479)
Net loss per share - basic and diluted	$ (0.16)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.15)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding - basic and diluted	63,745	48,850

Total costs related to goods produced and sold during the reporting period.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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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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