Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 4,234	$ (5,364)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	459	490
Amortization, abandonment, and impairment of intangibles	1,364	1,071
Stock-based compensation	3,438	2,346
Allowance (recovery) for doubtful accounts	7	113
Loss on disposal of equipment	12	27
Gain on sales of discontinued operations	0	(153)
Changes in operating assets and liabilities:
Accounts and other receivables	1,577	(28)
Inventories	141	64
Prepaid expenses and other current assets	(164)	(294)
Other assets	(58)	(45)
Accounts payable	142	1,214
Accrued compensation and other current liabilities	1,079	622
Deferred revenue and customer advances	5,076	(1,699)
Other long-term liabilities	(68)	339
Net cash provided by (used in) operating activities	17,239	(1,297)
Cash flows provided by (used in) used in investing activities:
Purchases of available-for-sale investments	(71,955)	(29,956)
Proceeds from maturities of available-for-sale investments	63,000	45,000
Additions to intangibles	(2,520)	(2,323)
Purchases of property and equipment	(174)	(931)
Proceeds from sales of discontinued operations	0	250
Net cash provided by (used in) investing activities	(11,649)	12,040
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	198	122
Exercise of stock options	6,318	974
Purchase of treasury stock	0	(5,248)
Net cash provided by (used in) financing activities	6,516	(4,152)
Net increase in cash and cash equivalents	12,106	6,591
Cash and cash equivalents:
Beginning of the period	4,558	7,298
End of the period	16,664	13,889
Supplemental disclosure of cash flow information:
Cash paid for taxes, net of refunds	13	21
Supplemental disclosure of non-cash operating, investing, and financing activities:
Amounts accrued for property and equipment, and intangibles	709	647
Release of Restricted Stock Units and Awards under company stock plan	$ 3,183	$ 1,298