Stock-Based Compensation

6 Months Ended

Jun. 30, 2015

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

Stock-Based Compensation

Note 3 Stock-Based Compensation

Total stock-based compensation expense recognized in our unaudited condensed consolidated statements of operations and comprehensive income (loss) 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,
	2015		2014		2015		2014
Total stock-based compensation expense	$	1,254	$	1,673	$	2,583	$	3,010

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,
	2015		2014		2015		2014
Expected dividend yield	0	%	0	%	0	%	0	%
Risk-free interest rate	1.70	%	1.20	%	1.26	%	1.19	%
Expected life (years)	5.5		3.8		4.4		3.8
Volatility	42	%	40	%	37	%	40	%

The total stock-based compensation amounts for 2015 and 2014 disclosed above are recorded in their respective line items within operating expenses in the unaudited condensed consolidated statements of operations and comprehensive income (loss). As of June 30, 2015, $12.8 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 2 years.