CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities:
Net loss	$ (15,080)	$ (10,935)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	540	1,638
Amortization of deferred financing fees	47	70
Provision for excess and obsolete inventories	605	186
Benefit from allowance for doubtful accounts	(21)	(129)
Non-cash restructuring charges, net	1,001	1,391
Stock-based compensation expense	1,425	1,936
Accrued royalty reversals, net	(832)	(2,030)
Loss on retirement of property and equipment	118	0
Changes in operating assets and liabilities:
Accounts receivable	2,101	1,371
Inventories	0	197
Prepaid expenses and other assets	(120)	(644)
Accounts payable	112	324
Accrued expenses and other current liabilities	(42)	(834)
Restructuring liabilities	(1,493)	(1,011)
Net cash used by operating activities	(11,639)	(8,470)
Investing activities:
Capital expenditures	(216)	(500)
Investments in non-publicly traded companies	(50)	(39)
Decrease in restricted cash	10	444
Purchases of short and long-term investments	0	(6,516)
Proceeds from sales and maturities of short-term investments	2,003	973
Net cash provided (used) by investing activities	1,747	(5,638)
Financing activities:
Issuance of common stock under employee stock plans	129	290
Proceeds from issuance of common stock, net of fees	5,114	16,073
Principal payments on 5.45% Convertible Notes due 2011	0	(3,758)
Net borrowings on credit facility	942	0
Net cash provided by financing activities	6,185	12,605
Effect of exchange rate changes on cash and cash equivalents	(227)	(327)
Change in cash and cash equivalents	(3,934)	(1,830)
Cash and cash equivalents at beginning of period	5,453	6,280
Cash and cash equivalents at end of period	$ 1,519	$ 4,450