Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net earnings (loss)	$ 14,284us-gaap_NetIncomeLoss	$ (15,674)us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings (loss) to net cash used in operating activities:
Gain on pooled patents agreement related to sale of license	(21,000)	0
Earnings from discontinued operations, net of tax	0	(625)
Share-based compensation	1,542us-gaap_ShareBasedCompensation	2,577us-gaap_ShareBasedCompensation
Depreciation and amortization	2,892	3,219
Non-cash restructuring costs	0us-gaap_AssetImpairmentCharges	941us-gaap_AssetImpairmentCharges
Other non-cash items	236us-gaap_OtherNoncashExpense	285us-gaap_OtherNoncashExpense
Changes in operating assets and liabilities:
Accounts receivable	1,468	(1,049)
Inventories	1,737us-gaap_IncreaseDecreaseInInventories	4,285us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	578	(316)
Accounts payable and accrued expenses	(7,715)	(8,907)
Other liabilities	(1,220)	(828)
Net cash used in operating activities of continuing operations	(7,198)	(16,092)
Investing activities
Purchases of property, equipment and leasehold improvements	(289)	(405)
Purchases of marketable securities	(10,007)	(9,994)
Maturities of marketable securities	10,052	8,679
Proceeds from pooled patents agreement	6,000	0
Net cash provided by (used in) investing activities of continuing operations	5,756	(1,720)
Financing activities
Payments on term loan and capital lease obligations	(1,909)	(1,906)
Proceeds from common stock issued under employee stock plans	177	592
Net cash used in financing activities of continuing operations	(1,732)	(1,314)
Net cash provided by operating activities of discontinued operations	0	2,919
Net cash used in investing activities of discontinued operations	0	(28)
Net cash provided by discontinued operations	0	2,891
Effect of exchange rate changes on cash and cash equivalents	(45)	(14)
Net decrease in cash and cash equivalents	(3,219)	(16,249)
Cash and cash equivalents at beginning of period	63,309	61,589
Cash and cash equivalents at end of period	$ 60,090	$ 45,340

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