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]
Net sales	$ 164,885us-gaap_Revenues	$ 164,164us-gaap_Revenues
Cost of sales	129,908us-gaap_CostOfRevenue	123,887us-gaap_CostOfRevenue
Gross profit	34,977us-gaap_GrossProfit	40,277us-gaap_GrossProfit
Operating expenses
Selling, general and administrative expenses	25,030	25,027
Research and development expenses	22,160us-gaap_ResearchAndDevelopmentExpense	23,137us-gaap_ResearchAndDevelopmentExpense
Total operating expenses	47,190us-gaap_OperatingExpenses	48,164us-gaap_OperatingExpenses
Operating loss	(12,213)us-gaap_OperatingIncomeLoss	(7,887)us-gaap_OperatingIncomeLoss
Interest expense, net	(4,063)	(4,070)
Foreign currency loss, net	(3,176)	(9,406)
Other income, net	556us-gaap_OtherNonoperatingIncomeExpense	561us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes	(18,896)	(20,802)
Income tax expenses	1,133us-gaap_IncomeTaxExpenseBenefit	803us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (20,029)us-gaap_NetIncomeLoss	$ (21,605)us-gaap_NetIncomeLoss
Loss per common share-
Basic	$ (0.59)us-gaap_EarningsPerShareBasic	$ (0.63)us-gaap_EarningsPerShareBasic
Diluted	$ (0.59)us-gaap_EarningsPerShareDiluted	$ (0.63)us-gaap_EarningsPerShareDiluted
Weighted average number of shares-
Basic	34,056,468	34,052,875
Diluted	34,056,468	34,052,875

The aggregate cost of goods produced and sold and services rendered during the reporting period.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (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 before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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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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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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The net amount of nonoperating interest income (expense).

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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

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The net amount of other income and expense 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 (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense 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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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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