Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities from continuing operations:
Net (loss) income	$ (234)	$ 13,907	$ (1,515)
Loss (income) from discontinued operations, net of tax	67	(12,102)	(1,932)
(Loss) income from continuing operations	(167)	1,805	(3,447)
Adjustments to reconcile (loss) income from continuing operations to net cash (used in) provided by operating activities:
Depreciation	1,258	1,394	1,203
Stock-based compensation expense	2,070	3,559	3,017
Provision for bad debts	70	38	29
Change in reserve for excess and obsolete inventory	(15)	120	65
Gain on sale of non-marketable securities	0	(4,021)	0
Loss (gain) on sale of assets, net	16	53	(139)
Impairment of investments	0	0	8
Changes in assets and liabilities:
Accounts receivable	(8,739)	(322)	14
Inventories	(3,514)	(7,842)	4,322
Prepaid expenses and other assets	96	(1,855)	450
Accounts payable	58	4,636	(7,482)
Deferred revenue	525	744	2,287
Accrued liabilities and other	2,396	122	678
Other long-term liabilities	(29)	(314)	65
Net cash (used in) provided by operating activities	(5,975)	(1,883)	1,070
Cash flows from investing activities:
Purchase of property and equipment	(216)	(113)	(1,733)
Proceeds from sale of non-marketable equity investment	0	6,000	0
Proceeds from sale of discontinued operations	3,000	17,000	0
Transaction costs from sale of discontinued operations	0	(1,100)	0
Proceeds from sales of intangible assets, net	0	0	906
Net cash provided by (used in) investing activities	2,784	21,787	(827)
Cash flows from financing activities:
Proceeds from issuance of common stock	317	355	1,014
Repurchase of stock	(1,297)	(1,204)	(356)
Net cash (used in) provided by financing activities	(980)	(849)	658
Cash flows from discontinued operations:
Net cash (used in) provided by operating activities	(39)	2,395	1,479
Net cash (used in) investing activities	0	(1,066)	(803)
Net cash (used in) provided by discontinued operations	(39)	1,329	676
Net change in cash and cash equivalents	(4,210)	20,384	1,577
Cash and cash equivalents, beginning of year	57,294	36,910	35,333
Cash and cash equivalents, end of period	$ 53,084	$ 57,294	$ 36,910