Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 98,284	$ 94,918
Short-term investments	9,895	5,496
Accounts receivable, net of allowance for doubtful accounts of $182 and $244 at December 31, 2010 and December 31, 2011, respectively	23,504	20,846
Current portion of deferred income taxes	82	365
Prepaid expenses and other current assets	1,966	3,790
Total current assets	133,731	125,415
Property, equipment and software, net	17,843	6,183
Intangible assets, net	5,094	7,534
Goodwill	38,029	26,278
Deferred income taxes, net of current portion	0	8,314
Other assets	1,046	156
Total assets	195,743	173,880
Current liabilities:
Accounts payable	725	652
Accrued compensation	3,695	3,375
Accrued expenses	13,463	5,429
Current portion of notes payable and capital lease obligations	176	152
Current portion of deferred revenue	62,010	55,722
Total current liabilities	80,069	65,330
Notes payable and capital lease obligations, net of current portion	854	192
Other liabilities	8,331	2,005
Deferred income taxes, net of current portion	2,781	1,065
Deferred revenue, net of current portion	987	854
Total liabilities	93,022	69,446
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 10,000,000 shares authorized; no shares issued and outstanding at December 31, 2010 and December 31, 2011
Common stock, $0.01 par value, 90,000,000 shares authorized; 20,374,267 and 21,750,525 issued at December 31, 2010 and December 31, 2011, respectively; 17,982,425 and 18,722,384 shares outstanding at December 31, 2010 and December 31, 2011, respectively	218	204
Additional paid-in capital	200,273	166,985
Treasury stock, 2,391,842 and 3,028,141 shares at December 31, 2010 and December 31, 2011, respectively, at cost	(48,423)	(28,417)
Accumulated other comprehensive loss	(607)	(175)
Accumulated deficit	(48,740)	(34,163)
Total stockholders' equity	102,721	104,434
Total liabilities and stockholders' equity	$ 195,743	$ 173,880