Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

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

Assumptions used in the Black-Scholes Option-Pricing Model

The assumptions used in the Black-Scholes option-pricing model for the three and six months ended June 30, 2015 and 2014 are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015	2014
Risk free interest rate	1.6% to 1.8%		1.6% to 1.9%		1.5% to 1.8%	1.6% to 2.0%
Expected term	5.1 to 6.1 years		5.1 to 6.1 years		5.1 to 6.1 years	5.1 to 6.1 years
Expected volatility	76.7% to 79.2%		84.2% to 84.7%		76.7% to 79.2%	84.2% to 84.9%
Expected dividend yield	—	%	—	%	—%	—%

Stock-Based Compensation Expense

The Company recognized stock-based compensation expense in continuing operations as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Cost of goods sold	$	103	$	141	$	196	$	268
Research and development	186		364		409		721
Selling, general and administrative	2,081		1,769		3,115		3,329
Total	$	2,370	$	2,274	$	3,720	$	4,318