Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities from continuing operations:
Net loss	$ (6,394)	$ (3,867)
Loss from discontinued operations, net of tax	0	69
Loss from continuing operations	(6,394)	(3,798)
Adjustments to reconcile loss from continuing operations to net cash used in operating activities:
Depreciation and amortization expense	620	630
Stock-based compensation expense	1,055	1,464
Provision for bad debts	(5)	(3)
Provision for inventory write-downs	66	427
Loss on disposal of assets, net	0	2
Changes in assets and liabilities:
Accounts receivable	5,650	(1,897)
Inventories	2,382	1,960
Prepaid expenses and other assets	460	(359)
Accounts payable	(6,809)	(5,868)
Deferred revenue	(986)	(262)
Accrued and other liabilities	(3,437)	(1,613)
Other long-term liabilities	14	(15)
Net cash used in operating activities	(7,384)	(9,332)
Cash flows from investing activities:
Purchase of property and equipment	(103)	(5)
Net cash used in investing activities	(103)	(5)
Cash flows from financing activities:
Proceeds from issuance of common stock	19	272
Repurchase of stock	(339)	(534)
Net cash used in financing activities	(320)	(262)
Cash flows from discontinued operations:
Net cash used in operating activities	0	(41)
Net cash used in discontinued operations	0	(41)
Net change in cash and cash equivalents	(7,807)	(9,640)
Cash and cash equivalents, beginning of year	53,084	57,294
Cash and cash equivalents, end of period	$ 45,277	$ 47,654