Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities from continuing operations:
Net income (loss)	$ (1,190)	$ (4,448)	$ (14,021)
Loss from discontinued operations	0	248	0
Income (loss) from continuing operations	(1,190)	(4,200)	(14,021)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,922	2,277	2,157
Stock-based compensation expense	3,656	2,253	2,651
Provision for bad debts	27	0	46
Provision for excess and obsolete inventory	65	42	17
Provision for returns	301	350	258
(Gain) Loss on sale of assets	(65)	(1,391)	1,020
Impairment of investments	8	0	4,585
Accounts receivable	(1,213)	(779)	78
Inventories	4,322	(8,084)	(2,033)
Prepaid expenses and other assets	606	361	(471)
Accounts payable	(7,054)	7,209	1,735
Deferred revenue	1,664	908	337
Accrued restructuring liabilities	0	(1,238)	(2,878)
Accrued liabilities and other	(483)	(619)	858
Other long-term liabilities	(6)	(26)	(66)
Net cash provided by (used in) operating activities from continuing operations	2,560	(2,937)	(5,727)
Cash flows from investing activities from continuing operations:
Change in restricted cash	0	1,000	0
Purchase of property and equipment	(2,516)	(4,191)	(1,001)
Maturities or sale of investments and marketable securities	0	10,207	659
Acquistion of a business, net of cash acquired	0	(1,000)	(2,613)
Proceeds from sales of intangible assets, net	906	1,040	172
Purchase of intangible assets	(20)	(122)	(122)
Net cash (used in) provided by investing activities from continuing operations:	(1,630)	6,934	(2,905)
Cash flows from financing activities from continuing operations:
Proceeds from issuance of common stock	1,014	1,962	259
Repurchase of stock	(356)	(157)	(3,195)
Net cash (used in) provided by financing activities from continuing operations:	658	1,805	(2,936)
Cash flows from discontinued operations:
Net cash provided by (used in) operating activities	0	(48)	0
Net cash provided by investing activities	0	640	0
Net cash provided by discontinued operations	0	592	0
Effect of exchange rate changes on cash and cash equivalents	(11)	(4)	0
Net increase (decrease) in cash and cash equivalents	1,577	6,390	(11,568)
Cash and cash equivalents, beginning of year	35,333	28,943	40,511
Cash and cash equivalents, end of year	$ 36,910	$ 35,333	$ 28,943