Condensed Consolidated Statements of Cash Flows(Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements of Cash Flows [Abstract]
Net income (loss)	$ 2,253	$ (219)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	164	166
Amortization, abandonment, and impairment of intangibles	494	341
Stock-based compensation	1,037	720
Allowance (recovery) for doubtful accounts	16	0
Changes in operating assets and liabilities:
Accounts and other receivables	(1,480)	(1,475)
Inventories	65	(108)
Prepaid expenses and other current assets	183	56
Other assets	(13)	(20)
Accounts payable	1,113	1,303
Accrued compensation and other current liabilities	1,280	(415)
Deferred revenue and customer advances	14,565	1,097
Other long-term liabilities	(21)	343
Net cash provided by operating activities	19,656	1,789
Cash flows provided by (used in) used in investing activities:
Purchases of available-for-sale investments	(9,996)	(14,979)
Proceeds from maturities of available-for-sale investments	15,000	15,000
Additions to intangibles	(694)	(596)
Purchases of property and equipment	(76)	(828)
Net cash provided by (used in) investing activities	4,234	(1,403)
Cash flows provided by financing activities:
Issuance of common stock under employee stock purchase plan	72	51
Exercise of stock options	1,703	852
Net cash provided by financing activities	1,775	903
Net increase in cash and cash equivalents	25,665	1,289
Cash and cash equivalents:
Beginning of the period	4,558	7,298
End of the period	30,223	8,587
Supplemental disclosure of cash flow information:
Cash paid for taxes	14	6
Supplemental disclosure of non-cash operating, investing, and financing activities:
Amounts accrued for property and equipment, and intangibles	788	644
Release of Restricted Stock Units and Awards under company stock plan	$ 1,491	$ 780