Consolidated Balance Sheets (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 174,503	$ 158,712
Accounts receivable, net of allowance for doubtful accounts of $810 and $807, respectively	70,946	85,364
Prepaid expenses and other current assets	14,180	7,107
Deferred income taxes	527	527
Total current assets	260,156	251,710
Property and equipment, net	10,131	4,399
Intangible assets, net	306	388
Goodwill	2,861	2,746
Deferred income taxes	4,248	4,248
Deposits and other noncurrent assets	1,679	1,573
Total assets	279,381	265,064
Current liabilities:
Accounts payable	7,469	5,627
Deferred revenue	54,941	50,024
Accrued payroll and other related costs	27,976	25,262
Accrued expenses	16,921	21,391
Deferred income taxes	337	337
Total current liabilities	107,644	102,641
Long-term liabilities:
Deferred income taxes	48	48
Other long-term liabilities	7,605	3,185
Total liabilities	115,297	105,874
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value, 10,000,000 authorized, none issued and outstanding at June 30, 2011 and December 31, 2010	0	0
Common stock, $0.0001 par value, 300,000,000 shares authorized; 82,847,266 shares issued and outstanding at June 30, 2011 and 78,752,390 shares issued and outstanding at December 31, 2010	8	8
Additional paid-in-capital	167,557	157,928
(Accumulated deficit) retained earnings	(6,610)	133
Accumulated other comprehensive income	3,129	1,121
Total stockholders' equity	164,084	159,190
Total liabilities and stockholders' equity	$ 279,381	$ 265,064