Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2012

Shareholders' Equity [Abstract]

Fair values of stock option grants estimated with weighted average assumptions

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Dividend yield		0	%		0	%		0	%		0	%
Expected life		4 years			4 years			4 years			4 years
Expected volatility		73	%		74	%		73	%		74	%
Risk-free interest rate		0.6	%		1.3	%		0.6	%		1.5	%

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Cost of revenue — service	$	100	$	157	$	207	$	376
Selling, general and administrative		278		415		622		654
Research and development		30		35		63		77
Total stock-based compensation expense	$	408	$	607	$	892	$	1,107
Per diluted share	$	0.04	$	0.05	$	0.08	$	0.09

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		(29,476	)		2.49
Forfeited		(67,165	)		3.73
Expired		(50,501	)		9.84
Balance at June 30, 2012		1,957,208		$	4.32		3.72	$	395,000
Vested and expected to vest at June 30, 2012		1,872,527		$	4.27		3.63	$	391,000
Exercisable at June 30, 2012		1,373,749		$	3.83		3.02	$	353,000

Summary of certain information about stock options

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Weighted-average grant-date fair value of option grants for the period	$	1.88	$	3.99	$	2.23		4.61
Options in-the-money at period end		616,000		1,365,882		616,000		1,365,882
Aggregate intrinsic value of options exercised	$	1,000	$	209,000	$	33,000	$	751,000

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		(18,000	)		7.33
Forfeited		—			—
Unvested at June 30, 2012		9,000		$	4.82
Expected to vest after June 30, 2012		8,100		$	4.82

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		167,592			3.52
Vested		(47,844	)		5.15
Forfeited		(17,584	)		6.28
Unvested at June 30, 2012		343,412		$	5.03
Expected to vest after June 30, 2012		306,730		$	4.94

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

	June 30, 2012
Stock options outstanding		1,957,208
Restricted stock units outstanding		343,412
Stock options available for future grant		794,869
Common stock reserved for future issuance		3,095,489