Stock-Based Compensation

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Total stock-based compensation expense recognized in our consolidated statements of operations includes amounts related to stock options, restricted stock units, and employee stock purchase plans and was as follows (in thousands):

	Quarters Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Total stock-based compensation expense	$	2,020	$	1,722	$	4,058	$	4,065

The fair value of options granted determined using the Black-Scholes model used the following weighted-average assumptions:

	Quarters Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Expected dividend yield	0	%	0	%	0	%	0	%
Risk-free interest rate	0.52	%	0.55	%	0.55	%	0.65	%
Expected life (years)	5.4		3.8		4.3		3.8
Volatility	48	%	58	%	48	%	58	%

The total stock-based compensation amounts for 2013 and 2012 disclosed above are recorded in their respective line items within operating expenses in the consolidated statement of operations. No stock-based compensation was capitalized as part of the cost of an asset as of June 30, 2013 or December 31, 2012. As of June 30, 2013, we had $7.1 million of total unrecognized compensation cost, net of estimated forfeitures, related to stock awards. The unrecognized compensation cost is expected to be recognized over a weighted-average period of approximately 3 years.