CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net loss	$ (12,080)	$ (6,148)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	349	1,095
Amortization of deferred financing fees	27	36
Provision for excess and obsolete inventories	451	160
Benefit from allowance for doubtful accounts	(21)	(129)
Non-cash restructuring charges, net	1,001	467
Stock-based compensation expense	918	1,333
Accrued royalty reversals, net	(500)	(1,575)
Loss on retirement of property and equipment	118	0
Changes in operating assets and liabilities:
Accounts receivable	3,252	560
Inventories	141	516
Prepaid expenses and other assets	1	(370)
Accounts payable	(462)	141
Accrued expenses and other current liabilities	97	49
Restructuring liabilities	(641)	(480)
Net cash used by operating activities	(7,349)	(4,345)
Investing activities:
Capital expenditures	(159)	(343)
Investments in non-publicly traded companies	(30)	(26)
Decrease in restricted cash	10	444
Purchases of short and long-term investments	0	(6,633)
Proceeds from sales and maturities of short-term investments	2,003	973
Net cash provided (used) by investing activities	1,824	(5,585)
Financing activities:
Issuance of common stock under employee stock plans	100	236
Proceeds from issuance of common stock, net of fees	2,652	16,075
Principal payments on 5.45% Convertible Notes due 2011	0	(2,502)
Net borrowings on credit facility	713	0
Net cash provided by financing activities	3,465	13,809
Effect of exchange rate changes on cash and cash equivalents	(243)	(50)
Change in cash and cash equivalents	(2,303)	3,829
Cash and cash equivalents at beginning of period	5,453	6,280
Cash and cash equivalents at end of period	$ 3,150	$ 10,109