Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2012

Shareholders' Equity [Abstract]

Fair values of stock option grants estimated with weighted average assumptions

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Dividend yield		0	%		0	%		0	%		0	%
Expected life		4 years			4 years			4 years			4 years
Expected volatility		73	%		73	%		73	%		74	%
Risk-free interest rate		0.5	%		0.8	%		0.6	%		1.2	%

Impact on the results of operations of recording stock-based compensation expense

	Three Months Ended September 30,					Nine Months Ended September 30,
	2012			2011		2012		2011
Cost of revenue — service	$	34		$	184	$	242	$	560
Selling, general and administrative		(267	)		346		355		1,000
Research and development		26			48		89		125
Total stock-based compensation expense	$	(207	)	$	578	$	686	$	1,685
Per diluted share	$	(0.02	)	$	0.05	$	0.06	$	0.14

Summary of stock option activity under the plans

Stock Options	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Balance at January 1, 2012		1,939,475		$	4.49
Granted at fair value		164,875			3.44
Exercised		(82,424	)		2.43
Forfeited		(309,932	)		6.85
Expired		(85,627	)		7.06
Balance at September 30, 2012		1,626,367		$	3.90		4.12	$	485,000
Vested and expected to vest at September 30, 2012		1,581,671		$	3.90		3.99	$	482,000
Exercisable at September 30, 2012		1,319,717		$	3.90		3.06	$	448,000

Summary of certain information about stock options

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Weighted-average grant-date fair value of option grants for the period	$	—	$	3.67	$	2.23	$	4.52
Options in-the-money at period end		616,350		1,040,047		616,350		1,040,047
Aggregate intrinsic value of options exercised	$	34,000	$	119,000	$	67,000	$	871,000

Summary of Restricted Stock Award activity

	Number of Shares			Weighted Average Grant-Date Fair Value Per Share
Unvested at December 31, 2011		27,000		$	6.49
Granted		—			—
Vested		(27,000	)		6.49
Forfeited		—			—
Unvested at September 30, 2012		0		$	0.00
Expected to vest after September 30, 2012		0		$	0.00

Summary of Restricted Stock Unit activity

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at December 31, 2011		241,248		$	6.20
Granted		177,592			3.49
Vested		(95,103	)		4.97
Forfeited		(26,019	)		6.28
Unvested at September 30, 2012		297,718		$	4.97
Expected to vest after September 30, 2012		268,879		$	4.88

Summary of shares of common stock reserved for future issuance under the Plans

	September 30, 2012
Stock options outstanding		1,626,367
Restricted stock units outstanding		297,718
Stock options available for future grant		1,071,447
Common stock reserved for future issuance		2,995,532