CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net loss	$ (3,107)	$ (6,083)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	107	177
Amortization of deferred financing fees	22	7
Provision for excess and obsolete inventorie	82	231
Non-cash restructuring charges, net	254	0
Stock-based compensation expense	574	532
Accrued royalty reversals, net	(179)	(58)
Loss on retirement of property and equipment	0	118
Changes in operating assets and liabilities:
Accounts receivable	(583)	2,154
Inventories	(168)	73
Prepaid expenses and other assets	(102)	(207)
Accounts payable	2,061	230
Accrued expenses and other current liabilities	131	(350)
Restructuring liabilities	(587)	(600)
Net cash used by operating activities	(1,494)	(3,776)
Investing activities:
Capital expenditures	(36)	(95)
Investments in non-publicly traded companies	0	(30)
Decrease in restricted cash	0	10
Proceeds from sales and maturities of short-term investments	0	500
Net cash (used) provided by investing activities	(36)	385
Financing activities:
Issuance of common stock under employee stock plans	13	100
Proceeds from issuance of common stock, net of fees	1,042	(66)
Net (payments) borrowings on credit facility	(1,144)	1,350
Net cash (used) provided by financing activities	(89)	1,384
Effect of exchange rate changes on cash and cash equivalents	(23)	45
Change in cash and cash equivalents	(1,642)	(1,962)
Cash and cash equivalents at beginning of period	2,156	5,453
Cash and cash equivalents at end of period	$ 514	$ 3,491