Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (14,535)us-gaap_NetIncomeLoss	$ (19,444)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment	1,710us-gaap_Depreciation	1,580us-gaap_Depreciation
Amortization of intangible assets	508us-gaap_AmortizationOfIntangibleAssets	400us-gaap_AmortizationOfIntangibleAssets
Impairment of fixed assets	1,118us-gaap_AssetImpairmentCharges	607us-gaap_AssetImpairmentCharges
Share-based compensation expense	5,976us-gaap_ShareBasedCompensation	4,357us-gaap_ShareBasedCompensation
Amortization of premium on investments	300	196
Amortization of discount on convertible senior notes	2,068	1,834
Amortization of deferred financing costs	111us-gaap_AmortizationOfFinancingCosts	99us-gaap_AmortizationOfFinancingCosts
Change in fair value of contingent consideration	2,100	3,140
Other	(6)us-gaap_OtherNoncashIncomeExpense	32us-gaap_OtherNoncashIncomeExpense
Change in operating assets and liabilities:
Accounts receivable	(105)	(13,273)
Inventories	(436)us-gaap_IncreaseDecreaseInInventories	(3,411)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(1,445)	954
Accounts payable	(2,625)	(2,806)
Accrued interest on convertible senior notes	1,258	1,258
Other accrued liabilities	(3,662)	7,246
Other long-term liabilities	(124)	(81)
Net cash used in operating activities	(7,789)	(17,312)
CASH FLOWS FROM INVESTING ACTIVITIES
Maturities of investments	5,000	3,245
Additions to property, plant and equipment, net	(720)	(3,039)
Additions to patents	(486)	(279)
Cash received from security deposits	294
Net cash provided by (used in) investing activities	4,088	(73)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	31	370
Net cash provided by financing activities	31	370
Effect of exchange rate changes on cash and cash equivalents	3,249	(277)
DECREASE IN CASH AND CASH EQUIVALENTS	(421)	(17,292)
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD	102,946	162,880
CASH AND CASH EQUIVALENTS - END OF PERIOD	$ 102,525	$ 145,588

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