Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 21,817	$ 32,584
Short-term investments	10,474	17,550
Accounts receivable, net of allowance for doubtful accounts of $1,148 and $1,026 as of June 30, 2011 and December 31, 2010, respectively	28,961	24,678
Prepaid expenses and other current assets	1,550	1,021
Deferred tax assets	849	729
Total current assets	63,651	76,562
Property and equipment, net	7,289	6,235
Long-term investments	22,094	0
Goodwill	92,470	92,382
Intangible assets, net of accumulated amortization	10,208	10,469
Deferred tax assets	7,675	7,985
Other assets	214	125
Total assets	203,601	193,758
Current liabilities:
Accounts payable	4,066	3,797
Accrued expenses and other current liabilities	3,934	2,181
Accrued compensation expenses	960	1,979
Income taxes payable	443	226
Deferred revenue	9,050	6,603
Total current liabilities	18,453	14,786
Long-term liabilities:
Other liabilities	4,494	5,112
Total liabilities	22,947	19,898
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value per share, 100,000,000 shares authorized, 43,533,368 shares issued and 37,675,490 shares outstanding at June 30, 2011 and 42,901,926 shares issued and 37,044,048 shares outstanding at December 31, 2010	44	43
Treasury stock	(35,343)	(35,343)
Additional paid-in capital	251,205	246,080
Accumulated other comprehensive (loss) income	(70)	5
Accumulated deficit	(35,182)	(36,925)
Total stockholders' equity	180,654	173,860
Total liabilities and stockholders' equity	$ 203,601	$ 193,758