CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement Of Cash Flows [Abstract]
Net income (loss)	$ 3,029	$ (2,374)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	313	327
Amortization, abandonment, and impairment of intangibles	877	734
Stock-based compensation	2,189	1,538
Allowance (recovery) for doubtful accounts	24	12
Loss on disposal of equipment	12	18
Gain on sales of discontinued operations	0	(153)
Changes in operating assets and liabilities:
Accounts and other receivables	981	(1,273)
Inventories	100	20
Prepaid expenses and other current assets	(239)	(264)
Other assets	(41)	(25)
Accounts payable	292	1,149
Accrued compensation and other current liabilities	(8)	(532)
Deferred revenue and customer advances	8,652	(502)
Other long-term liabilities	(46)	359
Net cash provided by (used in) operating activities	16,135	(966)
Cash flows provided by (used in) used in investing activities:
Purchases of available-for-sale investments	(52,971)	(29,956)
Proceeds from maturities of available-for-sale investments	35,000	35,000
Additions to intangibles	(1,770)	(1,466)
Purchases of property and equipment	(159)	(868)
Proceeds from sales of discontinued operations	0	250
Net cash provided by (used in) investing activities	(19,900)	2,960
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	72	51
Exercise of stock options	6,039	941
Purchase of treasury stock	0	(1,887)
Net cash provided by (used in) financing activities	6,111	(895)
Net increase in cash and cash equivalents	2,346	1,099
Cash and cash equivalents:
Beginning of the period	4,558	7,298
End of the period	6,904	8,397
Supplemental disclosure of cash flow information:
Cash paid for taxes	5	18
Supplemental disclosure of non-cash operating, investing, and financing activities:
Amounts accrued for property and equipment, and intangibles	388	644
Amounts accrued for purchase of treasury stock	0	161
Release of Restricted Stock Units and Awards under company stock plan	$ 2,942	$ 1,259