CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 29,753	$ 30,852	[1]
Short-term investments	29,721	25,498	[1]
Accounts receivable, net	10,158	9,689	[1]
Prepaid expenses and other current assets	1,746	1,359	[1]
Total current assets	71,378	67,398	[1]
Property and equipment, net	534	591	[1]
Goodwill	14,240	14,240	[1]
Purchased technology, net	41	62	[1]
Intangible assets, net	4,440	4,775	[1]
Other assets	1,155	1,193	[1]
Total assets	91,788	88,259	[1]
Current liabilities:
Accounts payable	1,065	444	[1]
Accrued compensation	2,354	1,609	[1]
Other accrued liabilities	4,785	3,969	[1]
Short-term deferred revenue	6,177	6,618	[1]
Total current liabilities	14,381	12,640	[1]
Long-term deferred revenue	108	35	[1]
Other long-term liabilities	1,479	1,421	[1]
Total liabilities	15,968	14,096	[1]
Commitments and contingencies (Note 6)			[1]
Stockholders' equity:
Common stock; par value $0.0001, 150,000,000 shares authorized; 51,348,437 issued and 50,155,839 outstanding at March 31, 2013; 50,002,587 issued and 49,809,989 outstanding at December 31, 2012	5	5	[1]
Additional paid-in capital	246,844	242,954	[1]
Treasury stock	(5,036)	(922)	[1]
Accumulated other comprehensive loss	(1,502)	(1,501)	[1]
Accumulated deficit	(164,491)	(166,373)	[1]
Total stockholders' equity	75,820	74,163	[1]
Total liabilities and stockholders' equity	$ 91,788	$ 88,259	[1]

[1] Derived from the December 31, 2012 audited Consolidated Financial Statements included in the Annual Report on Form10-K, as filed with the Securities and Exchange Commission on March 8, 2013.