Stock-based Compensation

6 Months Ended

Jun. 30, 2018

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

Stock-based Compensation

Stock-based Compensation

Stock compensation expense for both equity-classified and liability-classified awards for the three and six months ended June 30, 2018 was $1.3 million and $1.9 million, respectively. Stock compensation expense for both equity-classified and liability-classified awards for the three and six months ended June 30, 2017 was $0.9 million and $1.2 million, respectively. Stock compensation expense is recognized in cost of goods sold, selling, general and administrative expenses, and research and development expenses. At June 30, 2018, there was $5.8 million of unrecognized compensation cost relating to outstanding unvested equity instruments expected to be recognized over the weighted average period of 1.8 years.