Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2010	$ 96,303	$ 159	$ 102,728	$ 2,867	$ 20	$ (9,471)
Beginning Balance, Shares at Dec. 31, 2010		14,689
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	860			860
Comprehensive income (loss)	(683)				(683)
Stock-based compensation	3,541		3,541
Registration fees	(10)		(10)
Tax benefit from exercise of stock options	19		19
Common stock issued under benefit plan	289		289
Common stock issued under benefit plan, shares		39
Acquisition of treasury stock	(3,679)					(3,679)
Acquisition of treasury stock, shares		(458)
Payment of restricted stock tax withholdings	(624)		(624)
Payment of restricted stock withholdings, shares		(47)
Exercise of stock options, vesting of restricted stock awards	652	3	649
Exercise of stock options, vesting of restricted stock awards		325
Ending Balance at Dec. 31, 2011	96,668	162	106,592	3,727	(663)	(13,150)
Ending Balance, Shares at Dec. 31, 2011		14,548
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,533			4,533
Comprehensive income (loss)	594				594
Stock-based compensation	4,124		4,124
Tax benefit from exercise of stock options	694		694
Common stock issued under benefit plan	308		308
Common stock issued under benefit plan, shares		27
Payment of restricted stock tax withholdings	(834)	(1)	(833)
Payment of restricted stock withholdings, shares		(61)
Exercise of stock options, vesting of restricted stock awards	1,344	4	1,340
Exercise of stock options, vesting of restricted stock awards		406
Ending Balance at Sep. 30, 2012
Beginning Balance at Dec. 31, 2011	96,668	162	106,592	3,727	(663)
Beginning Balance, Shares at Dec. 31, 2011		14,548
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,580			3,580
Comprehensive income (loss)	530				530
Stock-based compensation	3,679		3,679
Tax benefit from exercise of stock options	619		619
Common stock issued under benefit plan	271		271
Common stock issued under benefit plan, shares		27
Acquisition of treasury stock	0
Payment of restricted stock tax withholdings	(333)		(333)
Payment of restricted stock withholdings, shares		(34)
Exercise of stock options, vesting of restricted stock awards	690	4	686
Exercise of stock options, vesting of restricted stock awards		364
Ending Balance at Dec. 31, 2012	$ 105,704	$ 166	$ 111,514	$ 7,307	$ (133)	$ (13,150)
Ending Balance, Shares at Dec. 31, 2012	14,904,845	14,905