Consolidated Statements Of Stockholders' Equity And Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Beginning Balance at Dec. 31, 2008	$ 358	$ 117,926	$ 53,935	$ 895	$ 173,114
Beginning Balance, shares at Dec. 31, 2008	35,810
Repurchase of common stock	(7)	(12,076)			(12,083)
Repurchase of common stock, shares	(677)
Issuance of common stock for share-based compensation plans	17	(4,140)			(4,123)
Issuance of common stock for share-based compensation plans, shares	1,645
Issuance of stock under Employee Stock Purchase Plan		335			335
Issuance of stock under Employee Stock Purchase Plan, shares	15
Exercise of common stock warrants, shares	7
Issuance of stock awards		454			454
Issuance of stock awards, shares	18
Stock-based compensation expense		4,219			4,219
Tax benefit from exercise or vesting of equity awards, net of deferred tax asset deficiencies		14,671			14,671
Cash dividends declared			(4,371)		(4,371)
Comprehensive income:
Foreign currency translation adjustments				1,314	1,314
Net unrealized holding gain (loss) on investments available-for-sale, net of tax				(523)	(523)
Net income (loss)			32,212		32,212
Total comprehensive income					33,003
Ending Balance at Dec. 31, 2009	368	121,389	81,776	1,686	205,219
Ending Balance, shares at Dec. 31, 2009	36,818
Repurchase of common stock	(3)	(8,289)			(8,292)
Repurchase of common stock, shares	(295)
Issuance of common stock for share-based compensation plans	7	(4,720)			(4,713)
Issuance of common stock for share-based compensation plans, shares	690
Issuance of stock under Employee Stock Purchase Plan		595			595
Issuance of stock under Employee Stock Purchase Plan, shares	22
Issuance of stock awards		420			420
Issuance of stock awards, shares	15
Stock-based compensation expense		6,325			6,325
Value of stock options issued for acquisition of Chordiant		3,519			3,519
Tax benefit from exercise or vesting of equity awards, net of deferred tax asset deficiencies		3,368			3,368
Cash dividends declared			(4,454)		(4,454)
Comprehensive income:
Foreign currency translation adjustments				149	149
Net unrealized holding gain (loss) on investments available-for-sale, net of tax				(338)	(338)
Less: reclassifications adjustment for gains included in net loss				(237)	(237)
Net income (loss)			(5,891)		(5,891)
Total comprehensive income					(6,317)
Ending Balance at Dec. 31, 2010	372	122,607	71,431	1,260	195,670
Ending Balance, shares at Dec. 31, 2010	37,250				37,250
Repurchase of common stock	(1)	(4,863)			(4,864)
Repurchase of common stock, shares	(139)
Issuance of common stock for share-based compensation plans	6	(4,293)			(4,287)
Issuance of common stock for share-based compensation plans, shares	575
Issuance of stock under Employee Stock Purchase Plan		647			647
Issuance of stock under Employee Stock Purchase Plan, shares	18
Issuance of stock awards		350			350
Issuance of stock awards, shares	8
Stock-based compensation expense		8,678			8,678
Tax benefit from exercise or vesting of equity awards, net of deferred tax asset deficiencies		6,575			6,575
Cash dividends declared			(4,510)		(4,510)
Comprehensive income:
Foreign currency translation adjustments				296	296
Net unrealized holding gain (loss) on investments available-for-sale, net of tax				93	93
Net income (loss)			10,108		10,108
Total comprehensive income					10,497
Ending Balance at Dec. 31, 2011	$ 377	$ 129,701	$ 77,029	$ 1,649	$ 208,756
Ending Balance, shares at Dec. 31, 2011	37,712				37,712