Stock-Based Compensation	3 Months Ended
Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	16. Stock-Based Compensation Equity compensation awards may be granted to certain eligible employees or non-employee directors. A detailed description of the awards granted prior to 2021 is included in the Company’s 2020 Annual Report on Form 10-K. The total number of shares of the Company’s common stock available for awards under the Company’s 2013 Omnibus Incentive Plan is 7,477,395 shares. The total number of shares of the Company’s common stock still available for issuance as of March 31, 2021 is 4,179,857 shares. Stock-based compensation expense was $2.5 million and $3.4 million for the three months ended March 31, 2021 and 2020, respectively, which was recorded in engineering, selling, and administrative expense in the Condensed Consolidated Statement of Operations. The Company recognizes stock-based compensation expense over the award’s vesting period, subject to retirement, death or disability provisions of the 2013 Omnibus Incentive Plan. No options to acquire shares of common stock were granted to employees during the three months ended March 31, 2021 and 250,432 shares of common stock were granted to employees during the three months ended March 31, 2020. The options granted become exercisable in three annual increments over a three-year period beginning on the grant date and expire 10 years subsequent to the grant date. A total of 316,974 and 277,449 restricted stock units were issued by the Company to employees during the three months ended March 31, 2021 and 2020, respectively. The restricted stock units granted to employees vest in three annual increments over a three-year period beginning on the grant date. A total of 203,697 and 321,599 performance shares units were issued by the Company to employees during the three months ended March 31, 2021 and 2020, respectively. Performance share units vest after three years and are earned based on the extent to which performance goals are met over the applicable performance period. The performance goals and the applicable performance period vary for each grant year. The performance goals for the performance share units granted in 2021 are weighted 60% on the 3-year average of the Company’s adjusted EBITDA percentage from 2021 to 2023 and 40% on non-new machines sales as of the year ended December 31, 2023. The 2021 performance share units include a +/-20% modifier weighted on total shareholder return relative to a defined peer group of companies during the three-year performance period, not to exceed 200% of target shares granted. The performance goals for the performance shares granted in 2020 are based 100% on the 3-year average of the Company’s adjusted EBITDA percentage from continuing operations from 2020 to 2022 with a +/-20% modifier based on total shareholder return relative to a defined peer group of companies during the three-year performance period, not to exceed 200% of target shares granted. The Company issued a total of 56,672 and 77,608 equity grants to directors during the three months ended March 31, 2021 and 2020, respectively. The 2021 and 2020 equity compensation awards vested immediately upon the grant date.

Stock-Based Compensation

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

16. Stock-Based Compensation

Equity compensation awards may be granted to certain eligible employees or non-employee directors. A detailed description of the awards granted prior to 2021 is included in the Company’s 2020 Annual Report on Form 10-K. The total number of shares of the Company’s common stock available for awards under the Company’s 2013 Omnibus Incentive Plan is 7,477,395 shares. The total number of shares of the Company’s common stock still available for issuance as of March 31, 2021 is 4,179,857 shares.

Stock-based compensation expense was $2.5 million and $3.4 million for the three months ended March 31, 2021 and 2020, respectively, which was recorded in engineering, selling, and administrative expense in the Condensed Consolidated Statement of Operations. The Company recognizes stock-based compensation expense over the award’s vesting period, subject to retirement, death or disability provisions of the 2013 Omnibus Incentive Plan.

No options to acquire shares of common stock were granted to employees during the three months ended March 31, 2021 and 250,432 shares of common stock were granted to employees during the three months ended March 31, 2020. The options granted become exercisable in three annual increments over a three-year period beginning on the grant date and expire 10 years subsequent to the grant date.

A total of 316,974 and 277,449 restricted stock units were issued by the Company to employees during the three months ended March 31, 2021 and 2020, respectively. The restricted stock units granted to employees vest in three annual increments over a three-year period beginning on the grant date.

A total of 203,697 and 321,599 performance shares units were issued by the Company to employees during the three months ended March 31, 2021 and 2020, respectively. Performance share units vest after three years and are earned based on the extent to which performance goals are met over the applicable performance period. The performance goals and the applicable performance period vary for each grant year. The performance goals for the performance share units granted in 2021 are weighted 60% on the 3-year average of the Company’s adjusted EBITDA percentage from 2021 to 2023 and 40% on non-new machines sales as of the year ended December 31, 2023. The 2021 performance share units include a +/-20% modifier weighted on total shareholder return relative to a defined peer group of companies during the three-year performance period, not to exceed 200% of target shares granted. The performance goals for the performance shares granted in 2020 are based 100% on the 3-year average of the Company’s adjusted EBITDA percentage from continuing operations from 2020 to 2022 with a +/-20% modifier based on total shareholder return relative to a defined peer group of companies during the three-year performance period, not to exceed 200% of target shares granted.

The Company issued a total of 56,672 and 77,608 equity grants to directors during the three months ended March 31, 2021 and 2020, respectively. The 2021 and 2020 equity compensation awards vested immediately upon the grant date.