CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 28,390	$ 30,852
Short-term investments	43,967	25,498
Accounts receivable, less allowance of $0 and $2 at December 31, 2013 and 2012, respectively	13,993	9,689
Prepaid expenses and other current assets	1,322	1,359
Total current assets	87,672	67,398
Property and equipment, net	461	591
Purchased technology, net	0	62
Goodwill	14,240	14,240
Intangible assets, net	3,454	4,775
Other assets	1,072	1,193
Total assets	106,899	88,259
Current liabilities:
Accounts payable	860	444
Accrued compensation	2,157	1,609
Other accrued liabilities	3,359	3,969
Short-term deferred revenue	3,323	6,618
Total current liabilities	9,699	12,640
Long-term deferred revenue	50	35
Other long-term liabilities	1,754	1,421
Total liabilities	11,503	14,096
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock; par value $0.0001, 150,000,000 shares authorized; 54,474,594 issued and 53,281,996 outstanding at December 31, 2013; 50,002,587 issued and 49,809,989 outstanding at December 31, 2012	5	5
Additional paid-in capital	258,291	242,954
Treasury stock	(5,036)	(922)
Accumulated other comprehensive loss	(1,874)	(1,501)
Accumulated deficit	(155,990)	(166,373)
Total stockholders' equity	95,396	74,163
Total liabilities and stockholders' equity	$ 106,899	$ 88,259