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Shared-Based Compensation | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [Abstract] |
Shared-Based Compensation | Share-Based Compensation The following table lists the components of share-based compensation expense by type of award.
|  | Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Stock options |  | $ | 140 |  |  | $ | 169 |  |  | $ | 321 |  |  | $ | 361 |
Restricted stock |  | 936 |  |  | 502 |  |  | 1,828 |  |  | 961 |
Performance share units |  | 335 |  |  | 435 |  |  | 558 |  |  | 657 |
Share-based compensation expense |  | $ | 1,411 |  |  | $ | 1,106 |  |  | $ | 2,707 |  |  | $ | 1,979 |
Stock Options During the six months ended June 30, 2020, we granted options to purchase 158,700 shares to certain key employees. The weighted average grant date fair value of the options granted during the six months ended June 30, 2020, was $4.76 per share. The fair value of our options cannot be determined by market value because they are not traded in an open market. Accordingly, we utilized the Black Scholes financial pricing model to estimate the fair value. The following table shows the weighted average assumptions relevant to determining the fair value of stock options granted in 2020.
| 2020
Expected term | 6 years
Risk free interest rate | 1.42 | %
Dividend yield | — | %
Expected volatility | 52.80 | %
The expected term is derived from using the simplified method of determining stock option terms as described under the Staff Accounting Bulletin Topic 14, Share-based payment. The simplified method was used because sufficient historical stock option exercise experience was not available, primarily due to the transformation of the management structure over the past several years. The average risk-free interest rate is derived from the United States Department of Treasury published interest rates of daily yield curves for the same time period as the expected term. The expected dividend yield reflects no expected annual dividends over the expected term because we discontinued dividends in 2019. The expected volatility rate is derived from our actual common stock historical volatility over the same time period as the expected term. The volatility rate is derived by a mathematical formula utilizing daily closing price data. The following table presents stock option activity for the six months ended June 30, 2020.
|  | Number of Options (in thousands) |  | Weighted- Average Exercise Price (per share) |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value |  |
Outstanding at January 1, 2020 |  | 775 |  |  | $ | 13.24 |  |  |  |  |  |  |
Granted |  | 159 |  |  | 9.44 |  |  |  |  |  |  |
Forfeited or expired |  | (44) |  |  | 14.53 |  |  |  |  |  |  |
Outstanding at June 30, 2020 |  | 890 |  |  | $ | 12.50 |  |  | 5.7 |  | $ | — |  |  | (1)
Exercisable at June 30, 2020 |  | 600 |  |  | $ | 13.92 |  |  | 4.0 |  | $ | — |  |  | (1)
_______________________________ (1)The aggregate intrinsic value is the sum of intrinsic values for each exercisable individual option grant. The intrinsic value is the amount by which the closing market price of our stock at June 30, 2020, was greater than the exercise price of any individual option grant. Restricted Stock During the six months ended June 30, 2020, we granted 460,255 shares of restricted stock to non-executive directors, officers and certain other key employees. The shares of restricted stock granted during the six months ended June 30, 2020, vest pro-rata generally over three years for officers and certain other key employees and over one year for non-executive directors and certain key employees. We determined the fair value of the shares awarded by using the closing price of our common stock as of the date of grant. The weighted average grant date value of restricted stock granted in the six months ended June 30, 2020, was $9.35 per share. Total grant-date fair value of restricted stock that vested in the six months ended June 30, 2020, was $1.0 million. The following table presents the status of unvested restricted stock awards as of June 30, 2020, and changes during the six months then ended.
|  | Nonvested Restricted Shares (in thousands) |  | Weighted Average Grant-Date Fair Value (per share)
Unvested at January 1, 2020 |  | 222 |  |  | $ | 9.33 |
Granted |  | 460 |  |  | 9.35 |
Vested |  | (116) |  |  | 8.97 |
Forfeited |  | (19) |  |  | 9.32 |
Unvested at June 30, 2020 |  | 547 |  |  | $ | 9.16 |
Performance Share Units Performance Share Units (“PSUs”) are a form of long-term incentive compensation awarded to executive officers and certain other key employees designed to directly align the interests of employees to the interests of our stockholders, and to create long-term stockholder value. PSUs granted in 2020 were made pursuant to the NN, Inc. 2019 Omnibus Incentive Plan and a Performance Share Unit Agreement (the “2019 Omnibus Agreement”). Some PSUs are based on total shareholder return (“TSR Awards”), and other PSUs are based on return on invested capital (“ROIC Awards”). The TSR Awards vest, if at all, upon our achieving a specified relative total shareholder return, which will be measured against the total shareholder return of the S&P SmallCap 600 Index during specified performance periods as defined in the 2019 Omnibus Agreement. The ROIC Awards vest, if at all, upon our achieving a specified average return on invested capital during the performance periods. Each performance period generally begins on January 1 of the year of grant and ends 36 months later on December 31. We recognize compensation expense over the performance period in which the performance and market conditions are measured. If the PSUs do not vest at the end of the performance periods, then the PSUs will expire automatically. Upon vesting, the PSUs will be settled by the issuance of shares of our common stock, subject to the award recipient’s continued employment. The actual number of shares of common stock to be issued to each award recipient at the end of the performance periods will be interpolated between a threshold and maximum payout amount based on actual performance results. No dividends will be paid on outstanding PSUs during the performance period; however, dividend equivalents will be paid based on the number of shares of common stock that are ultimately earned at the end of the performance periods. With respect to the TSR Awards, a participant will earn 50% of the target number of PSUs for “Threshold Performance,” 100% of the target number of PSUs for “Target Performance,” and 150% of the target number of PSUs for “Maximum Performance.” With respect to the ROIC Awards, a participant will earn 35% of the target number of PSUs for “Threshold Performance,” 100% of the target number of PSUs for “Target Performance,” and 150% of the target number of PSUs for “Maximum Performance. For performance levels falling between the values shown below, the percentages will be determined by interpolation. The following table presents the goals with respect to TSR Awards and ROIC Awards granted in 2020.
TSR Awards: |  | Threshold Performance (50% of Shares) |  | Target Performance (100% of Shares) |  | Maximum Performance (150% of Shares)
2020 grants |  | 35th Percentile |  | 50th Percentile |  | 75th Percentile
ROIC Awards: |  | Threshold Performance (35% of Shares) |  | Target Performance (100% of Shares) |  | Maximum Performance (150% of Shares)
2020 grants |  | 4.9% |  | 5.1% |  | 5.6%
We estimate the grant date fair value of TSR Awards using the Monte Carlo simulation model, as the total shareholder return metric is considered a market condition under ASC Topic 718, Compensation – stock compensation. The grant date fair value of ROIC Awards is based on the closing price of a share of our common stock on the date of grant. The following table presents the number of PSUs granted and the grant date fair value in the period presented.
|  | TSR Awards |  |  |  | ROIC Awards |  |
Award Year |  | Shares (in thousands) |  | Grant Date Fair Value (per share) |  | Shares (in thousands) |  | Grant Date Fair Value (per share)
2020 |  | 139 |  | $10.88 |  | 157 |  | $9.44
We recognize expense for ROIC Awards based on the probable outcome of the associated performance condition. We generally recognize an expense for ROIC Awards based on the Target Performance threshold of 100% because, at the date of grant, the Target Performance is the probable level of performance achievement. The following table presents the status of unvested PSUs as of June 30, 2020, and changes during the six months then ended.
|  | Nonvested TSR Awards |  |  |  | Nonvested ROIC Awards |  |
|  | Shares (in thousands) |  | Weighted Average Grant-Date Fair Value (per share) |  | Shares (in thousands) |  | Weighted Average Grant-Date Fair Value (per share)
Nonvested at January 1, 2020 |  | 65 |  |  | $ | 13.27 |  |  | 79 |  |  | $ | 11.50 |
Granted |  | 139 |  |  | 10.88 |  |  | 157 |  |  | 9.44 |
Forfeited |  | (19) |  |  | 11.43 |  |  | (21) |  |  | 12.88 |
Nonvested at June 30, 2020 |  | 185 |  |  | $ | 10.53 |  |  | 215 |  |  | $ | 11.04 |

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