Condensed Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 76,767	$ 61,637
Accounts receivable, net of allowance of $269 and $351, respectively	26,602	33,959
Deferred tax assets - current portion	6,217	3,589
Prepaid expenses and other current assets	4,246	3,413
Total current assets	113,832	102,598
Property and equipment, net	5,799	3,898
Deferred tax assets - non-current portion	11,349	16,471
Other non-current assets	2,100	1,293
Total assets	133,080	124,260
Current liabilities:
Accounts payable	1,049	2,054
Accrued compensation and related benefits	7,138	10,723
Accrued and other current liabilities	1,784	2,882
Deferred revenues	2,890	3,232
Billings in excess of recognized revenues	516	807
Total current liabilities	13,377	19,698
Non-current liabilities	3,256	3,502
Total liabilities	16,633	23,200
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.00015 par value, 70,000 shares authorized: shares issued 34,630 and 34,027, respectively; shares outstanding 29,822 and 29,226, respectively	4	4
Additional paid-in-capital	226,682	220,361
Treasury stock at cost, 4,808 and 4,801 shares, respectively	(28,008)	(27,778)
Accumulated deficit	(82,295)	(91,578)
Accumulated other comprehensive income	64	51
Total stockholders’ equity	116,447	101,060
Total liabilities and stockholders’ equity	$ 133,080	$ 124,260