Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 116,121	$ 89,371
Accounts receivable, net of allowance of $273 and $354, respectively	27,064	34,860
Deferred tax assets - current portion	4,046	5,920
Prepaid expenses and other current assets	3,169	3,632
Total current assets	150,400	133,783
Property and equipment, net	8,679	7,064
Deferred tax assets - non-current portion	7,590	8,599
Other non-current assets	1,292	1,718
Total assets	167,961	151,164
Current liabilities:
Accounts payable	992	1,129
Accrued compensation and related benefits	5,181	7,707
Accrued and other current liabilities	1,564	1,593
Deferred revenues	2,637	2,096
Billings in excess of recognized revenues		343
Total current liabilities	10,374	12,868
Non-current liabilities	3,274	3,584
Total liabilities	13,648	16,452
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 36,050 and 35,285, respectively; shares outstanding 30,963 and 30,437, respectively	5	5
Additional paid-in-capital	245,807	233,813
Treasury stock at cost, 5,087 and 4,848 shares, respectively	(33,326)	(28,905)
Accumulated deficit	(57,937)	(70,649)
Accumulated other comprehensive income	(236)	448
Total stockholders’ equity	154,313	134,712
Total liabilities and stockholders’ equity	$ 167,961	$ 151,164