Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 4,731	$ 3,499
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	276	297
Stock-based compensation expense	1,309	905
Deferred taxes	981	(23)
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	(8)	(19)
Provisions for doubtful accounts		37
Loss on disposal of property and equipment	46
Tax benefit related to stock-based compensation expense	888
Excess tax benefit from stock-based compensation	(747)
Changes in operating assets and liabilities:
Accounts receivable	1,844	(6,786)
Prepaid expenses and other assets	(2,528)	(80)
Accounts payable	(1,064)	237
Accrued compensation and related benefits	(4,832)	810
Accrued and other liabilities	(1,055)	77
Deferred revenues	668	379
Billings in excess of recognized revenues	(159)	(746)
Net cash provided by (used in) operating activities	350	(1,413)
Investing activities:
Purchases of property and equipment	(1,211)	(127)
Net cash used in investing activities	(1,211)	(127)
Financing activities:
Proceeds from exercise of stock options	1,201	584
Proceeds from employee stock purchase plan	546	468
Excess tax benefit from stock-based compensation	747
Net cash provided by financing activities	2,494	1,052
Effect of exchange rate changes on cash and cash equivalents	(87)	(22)
Net change in cash and cash equivalents	1,546	(510)
Cash and cash equivalents, beginning of period	61,637	46,041
Cash and cash equivalents, end of period	63,183	45,531
Cash paid during the period for:
Income Taxes	$ 779	$ 440