Share-Based Payment (Tables)

6 Months Ended

Jun. 30, 2013

The following weighted average assumptions were used in the estimated grant date fair value calculations for stock option awards:



	Quarter Ended June30,
	2012		2013
Risk free interest rate	0.97	%	1.06	%
Expected dividend yield	—	%	—	%
Expected stock price volatility	62.3	%	65.7	%
Average expected life (in years)	6.02		5.99

The following table summarizes the Company’s stock option activity:



	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at December 31, 2012	772,496		$	18.57
Granted	48,350		12.53
Exercised	(3,665	)	6.20
Canceled	(53,330	)	33.37
Outstanding at June 30, 2013	763,851		$	17.22	7.11	$	4,486
Vested and expected to vest in the future at June 30, 2013	740,226		$	17.29	7.10	$	4,344
Exercisable at June 30, 2013	467,486		$	22.75	6.08	$	2,074

The following table summarizes the Company’s unvested stock option activity:



	Shares		Weighted-Average Grant-Date Fair Value
Unvested at December 31, 2012	430,915		$	4.90
Granted	48,350		7.42
Vested	(181,899	)	5.65
Canceled	(1,001	)	3.53
Unvested at June 30, 2013	296,365		$	4.83

The following table summarizes the Company’s unvested restricted stock activity:



	Shares		Weighted-Average Grant-Date Fair Value
Unvested at December 31, 2012	104,544		$	4.65
Granted	11,999		6.38
Vested	(11,107	)	5.20
Canceled	(2,000	)	20.70
Unvested at June 30, 2013	103,436		$	4.48