Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 120,828	$ 89,257
Marketable securities	100,170	100,299
Accounts receivable (net of allowance for doubtful accounts of $269 and $279 as of December 31, 2013 and June 30, 2014, respectively)	10,601	12,957
Prepaid expenses and other current assets	7,537	6,508
Restricted cash, current portion	1,492	23
Deferred income tax assets	3,053	3,053
Total current assets	243,681	212,097
Property and equipment, net	13,661	13,198
Restricted cash, net of current portion	2,584	3,902
Intangibles, net	17,476	16,886
Goodwill	25,007	18,712
Other assets	5,231	5,348
Deferred income tax assets	9,218	9,470
Total assets	316,858	279,613
Current liabilities:
Accounts payable	5,958	6,390
Accrued liabilities	19,023	20,110
Deferred revenue, current portion	106,496	82,496
Total current liabilities	131,477	108,996
Deferred revenue, net of current portion	1,845	2,667
Other long-term liabilities	2,022	611
Total liabilities	135,344	112,274
Commitments and contingencies (Note 10)
Preferred stock, $0.01 par value - 5,000,000 shares authorized, 0 shares outstanding as of December 31, 2013 and June 30, 2014	0	0
Equity:
Common stock, $0.01 par value - 75,000,000 shares authorized as of December 31, 2013 and June 30, 2014; 25,371,844 and 26,092,834 shares issued as of December 31, 2013 and June 30, 2014, respectively; 24,103,201 and 24,629,180 outstanding as of December 31, 2013 and June 30, 2014, respectively	262	254
Additional paid-in capital	219,127	200,235
(Accumulated deficit) retained earnings	895	(1,439)
Accumulated other comprehensive loss	(1,296)	(1,186)
Treasury stock, at cost - 1,268,643 and 1,463,654 shares as of December 31, 2013 and June 30, 2014, respectively	(37,474)	(30,525)
Total equity	181,514	167,339
Total liabilities and equity	$ 316,858	$ 279,613