Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities from continuing operations:
Net loss	$ (9,240)	$ (5,303)
Loss from discontinued operations, net of tax	0	70
Loss from continuing operations	(9,240)	(5,233)
Adjustments to reconcile loss from continuing operations to net cash used in operating activities:
Depreciation and amortization expense	981	950
Stock-based compensation expense	1,245	1,753
Provision for bad debts	(5)	164
Provision for inventory write-downs	76	712
Loss on disposal of assets, net	4	4
Changes in assets and liabilities, net of effects of acquisition:
Accounts receivable	3,334	(4,223)
Inventories	(11,538)	(3,727)
Prepaid expenses and other assets	442	(3,458)
Accounts payable	(1,651)	(4,164)
Deferred revenue	(541)	(331)
Accrued and other liabilities	(3,287)	(1,001)
Other long-term liabilities	28	(29)
Net cash used in operating activities	(20,152)	(18,583)
Cash flows from investing activities:
Acquisition of a business	(1,421)	0
Purchase of property and equipment	(209)	(8)
Proceeds from sale of discontinued operations	0	3,000
Net cash (used in) provided by investing activities	(1,630)	2,992
Cash flows from financing activities:
Payment of contingent consideration	(250)	0
Proceeds from issuance of common stock	29	292
Repurchase of stock	(348)	(1,286)
Net cash used in financing activities	(569)	(994)
Cash flows from discontinued operations:
Net cash used in operating activities	0	(42)
Net cash used in discontinued operations	0	(42)
Net change in cash and cash equivalents	(22,351)	(16,627)
Cash and cash equivalents, beginning of year	53,084	57,294
Cash and cash equivalents, end of period	$ 30,733	$ 40,667