Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Product sales	$ 113us-gaap_SalesRevenueGoodsNet	$ 46us-gaap_SalesRevenueGoodsNet
Collaboration revenue	81fcsc_CollaborationRevenue	0fcsc_CollaborationRevenue
Total revenues	194us-gaap_Revenues	46us-gaap_Revenues
Cost of revenues	147us-gaap_CostOfRevenue	793us-gaap_CostOfRevenue
Gross profit (loss)	47us-gaap_GrossProfit	(747)us-gaap_GrossProfit
Research and development expense	3,987us-gaap_ResearchAndDevelopmentExpense	7,915us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative expense	2,924	2,338
Operating loss	(6,864)us-gaap_OperatingIncomeLoss	(11,000)us-gaap_OperatingIncomeLoss
Other income (expense):
Warrant revaluation and other finance expense	(1,663)	(3,050)
Other income	0us-gaap_OtherNonoperatingIncome	40us-gaap_OtherNonoperatingIncome
Interest income	2us-gaap_InterestIncomeExpenseNet	1us-gaap_InterestIncomeExpenseNet
Loss before income taxes	(8,525)	(14,009)
Net loss	$ (8,525)	$ (14,009)
Per Share Information:
Basic and diluted	$ (0.21)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.35)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of common shares outstanding
Basic and diluted	40,861,329	40,583,591

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Periodic changes in fair value of warrants to purchase common stock and other periodic finance charges.

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The aggregate cost of goods produced and sold and services rendered 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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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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The net amount of operating interest income (expense).

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The net result for the period of deducting operating expenses from operating revenues.

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The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items.

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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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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