Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net loss	$ (11,799)us-gaap_NetIncomeLoss	$ (27,953)us-gaap_NetIncomeLoss	$ (25,463)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,931us-gaap_DepreciationAndAmortization	4,006us-gaap_DepreciationAndAmortization	4,430us-gaap_DepreciationAndAmortization
Long-lived assets write-off due to restructuring		1,011us-gaap_AssetImpairmentCharges
Change in fair value of contingent liability			(1,210)
Loss on disposal of fixed assets			163us-gaap_GainLossOnDispositionOfAssets
Provision for adjustments to accounts receivable and doubtful accounts	347us-gaap_ProvisionForDoubtfulAccounts	730us-gaap_ProvisionForDoubtfulAccounts	1,045us-gaap_ProvisionForDoubtfulAccounts
Provision for excess and obsolete inventory	124us-gaap_InventoryWriteDown	76us-gaap_InventoryWriteDown	73us-gaap_InventoryWriteDown
Non cash compensation related to stock options and restricted stock	3,652us-gaap_ShareBasedCompensation	3,533us-gaap_ShareBasedCompensation	3,949us-gaap_ShareBasedCompensation
Deferred income taxes	(2)
Change in operating accounts:
Accounts receivable	(1,000)	660	(1,473)
Income tax receivable	(7)	(18)	7,612
Inventories	(54)us-gaap_IncreaseDecreaseInInventories	(67)us-gaap_IncreaseDecreaseInInventories	60us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	114	(9)	268
Accounts payable and accrued liabilities	(2,189)	2,429	(2,992)
Deferred revenue	1,034	(972)	733
Net cash used in operating activities	(6,849)	(16,574)	(12,805)
Investing activities:
Capital expenditures	(216)	(829)	(322)
Sales of short-term investments	198	10,257	25,196
Net cash provided by (used in) investing activities	(18)	9,428	24,874
Financing activities:
Cash received from issuance of common stock, net of offering costs	5,242
Cash received from stock sale for employee stock purchase plan	21us-gaap_ProceedsFromStockPlans	36us-gaap_ProceedsFromStockPlans	66us-gaap_ProceedsFromStockPlans
Cash received from exercise of stock options	6		16
Repurchase of common stock			(753)
Net cash provided by (used in) financing activities	5,269	36	(671)
Net increase (decrease) in cash and cash equivalents	(1,598)	(7,110)	11,398
Cash and cash equivalents, beginning of period	11,763	18,873	7,475
Cash and cash equivalents, end of period	10,165	11,763	18,873
Supplemental disclosures of cash flow information:
Cash paid for income taxes	$ 75us-gaap_IncomeTaxesPaid	$ 165us-gaap_IncomeTaxesPaid	$ 257us-gaap_IncomeTaxesPaid

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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

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration