Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities from continuing operations:
Net (loss) income	$ (8,272)us-gaap_NetIncomeLoss	$ (234)us-gaap_NetIncomeLoss	$ 13,907us-gaap_NetIncomeLoss
Loss (income) from discontinued operations, net of tax	0	67	(12,102)
(Loss) income from continuing operations	(8,272)	(167)	1,805
Adjustments to reconcile (loss) income from continuing operations to net cash provided by (used in) operating activities:
Depreciation and amortization expense	1,383us-gaap_DepreciationAndAmortization	1,258us-gaap_DepreciationAndAmortization	1,394us-gaap_DepreciationAndAmortization
Stock-based compensation expense	1,445us-gaap_ShareBasedCompensation	2,070us-gaap_ShareBasedCompensation	3,559us-gaap_ShareBasedCompensation
Change in fair value of contingent consideration liability	106	0	0
Deferred income taxes	10us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for bad debts	(5)us-gaap_ProvisionForDoubtfulAccounts	70us-gaap_ProvisionForDoubtfulAccounts	38us-gaap_ProvisionForDoubtfulAccounts
Provision for inventory write-downs	102us-gaap_InventoryWriteDown	(15)us-gaap_InventoryWriteDown	120us-gaap_InventoryWriteDown
Gain on sale of non-marketable securities	0	0	(4,021)
Loss on disposal of assets, net	4us-gaap_GainLossOnDispositionOfAssets	16us-gaap_GainLossOnDispositionOfAssets	53us-gaap_GainLossOnDispositionOfAssets
Changes in assets and liabilities, net of effects of acquisition:
Accounts receivable	2,127	(8,739)	(322)
Inventories	3,136us-gaap_IncreaseDecreaseInInventories	(3,514)us-gaap_IncreaseDecreaseInInventories	(7,842)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	1,487	96	(1,855)
Accounts payable	2,154	58	4,636
Deferred revenue	179	525	744
Accrued and other liabilities	96	2,396	122
Other long-term liabilities	50	(29)	(314)
Net cash provided by (used in) operating activities	4,002	(5,975)	(1,883)
Cash flows from investing activities:
Acquisition of a business	(1,421)	0	0
Purchase of property and equipment	(343)	(216)	(113)
Proceeds from sale of non-marketable equity investment	0	0	6,000
Proceeds from sale of discontinued operations	0	3,000	17,000
Transaction costs from sale of discontinued operations	0	0	(1,100)
Net cash (used in) provided by investing activities	(1,764)	2,784	21,787
Cash flows from financing activities:
Payment of contingent consideration	(250)	0	0
Proceeds from issuance of common stock	30	317	355
Repurchase of stock	(355)	(1,297)	(1,204)
Net cash used in financing activities	(575)	(980)	(849)
Cash flows from discontinued operations:
Net cash (used in) provided by operating activities	0	(39)	2,395
Net cash used in investing activities	0	0	(1,066)
Net cash (used in) provided by discontinued operations	0	(39)	1,329
Net change in cash and cash equivalents	1,663	(4,210)	20,384
Cash and cash equivalents, beginning of year	53,084	57,294	36,910
Cash and cash equivalents, end of period	$ 54,747	$ 53,084	$ 57,294

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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