CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities:
Net loss	$ (6,894)	$ (12,080)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	242	349
Amortization of deferred financing fees	148	27
Provision for excess and obsolete inventories	148	451
Benefit from allowance for doubtful accounts	0	(21)
Non-cash restructuring charges, net	919	1,001
Stock-based compensation expense	1,006	918
Accrued royalty reversals, net	(612)	(500)
Loss on retirement of property and equipment		118
Change in fair value of derivative liability	(246)	0
Changes in operating assets and liabilities:
Accounts receivable	852	3,252
Inventories	(473)	141
Prepaid expenses and other assets	59	1
Accounts payable	581	(462)
Accrued expenses and other current liabilities	188	97
Restructuring liabilities	(940)	(641)
Net cash used by operating activities	(5,148)	(7,349)
Investing activities:
Capital expenditures	(87)	(159)
Investments in non-publicly traded companies	0	(30)
Decrease in restricted cash	0	10
Proceeds from sales and maturities of short-term investments	0	2,003
Net cash (used) provided by investing activities	(87)	1,824
Financing activities:
Issuance of common stock under employee stock plans	13	100
Proceeds from issuance of common stock, net of fees	4,605	2,652
Net (payments) borrowings on credit facility	(732)	713
Net cash provided by financing activities	3,886	3,465
Effect of exchange rate changes on cash and cash equivalents	(57)	(243)
Change in cash and cash equivalents	(1,406)	(2,303)
Cash and cash equivalents at beginning of period	2,156	5,453
Cash and cash equivalents at end of period	$ 750	$ 3,150