Shareholders' Equity

6 Months Ended

Jun. 30, 2012

Shareholders' Equity [Abstract]

Shareholders' Equity

6. Shareholders’ Equity

Stock Options

We have a Fourth Amended and Restated Stock Plan (the “Stock Plan”) and an inducement stock plan for newly hired employees (the “Inducement Plan”) (collectively, the “Plans”). Under the Plans, stock options may be granted with a fixed exercise price that is equivalent to fair market value on the date of grant. These options have a term of up to 10 years and vest over a predetermined period, generally four years. Incentive stock options granted under the Stock Plan may only be granted to our employees. The Plans also allow for awards of non-qualified stock options, stock appreciation rights, RSAs and unrestricted stock awards, and RSUs. The Inducement Plan was established in connection with the MPC acquisition. Initially, 250,000 shares were allocated for award under the Inducement Plan. The number of shares available for award under the Inducement Plan may be modified by our Board of Directors, subject to SEC and NASDAQ limitations.

Stock-Based Compensation

The estimated fair value of stock-based awards is recognized as compensation expense over the vesting period of the award, net of estimated forfeitures. We estimate forfeitures of stock-based awards based on historical experience and expected future activity. The fair value of RSAs and RSUs is determined based on the number of shares granted and the quoted price of our common stock on the date of grant. The fair value of stock option awards is estimated at the grant date based on the fair value of each vesting tranche as calculated by the Black-Scholes-Merton (“BSM”) option-pricing model. The BSM model requires various highly judgmental assumptions including expected volatility and option life. If any of the assumptions used in the BSM model change significantly, stock-based compensation expense may differ materially in the future from that recorded in the current period. The fair values of our stock option grants were estimated with the following 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	%

The impact on our results of operations of recording stock-based compensation expense for the three and six months ended June 30, 2012 and 2011 was as follows (in thousands, except per share amounts):

	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

Stock Option Activity

The following table summarizes stock option activity under the Plans for the six months ended June 30, 2012:

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

At June 30, 2012, total compensation cost related to stock options granted to employees but not yet recognized was $788,000, net of estimated forfeitures. This cost will be amortized on the straight-line method over a weighted-average period of approximately two years.

The following table summarizes certain information about stock options for the three and six months ended June 30, 2012 and 2011:

	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

The aggregate intrinsic value represents the difference between the exercise price of the underlying options and the quoted price of our common stock for the number of options that were in-the-money at period end or that were exercised during the period. We issue new shares of common stock upon exercise of stock options.

Restricted Stock Award Activity

The following table summarizes RSA activity for the six months ended June 30, 2012:

	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

At June 30, 2012, total compensation cost related to RSAs granted but not yet recognized was $4,000, net of estimated forfeitures. This cost will be amortized on the straight-line method over a period of approximately 0.1 years.

Restricted Stock Unit Activity

The following table summarizes RSU activity for the six months ended June 30, 2012:

	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

At June 30, 2012, total compensation cost related to RSUs granted but not yet recognized was $1.2 million, net of estimated forfeitures. This cost will be amortized on the straight-line method over a period of approximately 2.1 years.

Common Stock Reserved for Future Issuance

The following table summarizes our shares of common stock reserved for future issuance under the Plans at June 30, 2012:

	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