Stock-based Compensation

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Stock-based Compensation

Stock-based Compensation

Within July 2015, the Company adopted the 2015 Incentive Compensation Plan (as amended, the “Plan”), pursuant to which the Compensation Committee of the Company is authorized to grant up to 7,150,000 shares to officers and employees of the Company, in the form of equity-based awards, including time or performance based options and restricted stock.

In June 2019, the Company's shareholders approved the 2019 Employee Stock Purchase Plan (the "ESPP") which is effective July 1, 2019. 500,000 shares of common stock are reserved for issuance under the ESPP. As of June 30, 2019, no shares had been issued under the ESPP.

Stock compensation expense for equity-classified and liability-classified awards for the three and six months ended June 30, 2019 was $0.6 million and $1.2 million, respectively. Stock compensation expense for 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 is recognized in cost of goods sold, selling, general and administrative expenses, and research and development expenses. At June 30, 2019, there was $5.1 million of unrecognized compensation cost relating to outstanding unvested equity instruments expected to be recognized over the weighted average period of 2.1 years.