CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 30,622	$ 30,852	[1]
Short-term investments	37,828	25,498	[1]
Accounts receivable, net	13,644	9,689	[1]
Prepaid expenses and other current assets	2,236	1,359	[1]
Total current assets	84,330	67,398	[1]
Property and equipment, net	507	591	[1]
Goodwill	14,240	14,240	[1]
Purchased technology, net	0	62	[1]
Intangible assets, net	3,770	4,775	[1]
Other assets	1,038	1,193	[1]
Total assets	103,885	88,259	[1]
Current liabilities:
Accounts payable	1,239	444	[1]
Accrued compensation	3,138	1,609	[1]
Other accrued liabilities	3,856	3,969	[1]
Short-term deferred revenue	4,358	6,618	[1]
Total current liabilities	12,591	12,640	[1]
Long-term deferred revenue	32	35	[1]
Other long-term liabilities	1,604	1,421	[1]
Total Liabilities	14,227	14,096	[1]
Commitments and contingencies (Note 4)			[1]
Stockholders' equity:
Common stock; par value $0.0001, 150,000,000 shares authorized; 53,939,053 issued and 52,746,455 outstanding at September 30, 2013; 50,002,587 issued and 49,809,989 outstanding at December 31, 2012	5	5	[1]
Additional paid-in capital	255,444	242,954	[1]
Treasury stock	(5,036)	(922)	[1]
Accumulated other comprehensive loss	(1,893)	(1,501)	[1]
Accumulated deficit	(158,862)	(166,373)	[1]
Total stockholders' equity	89,658	74,163	[1]
Total liabilities and stockholders' equity	$ 103,885	$ 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.