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Stockholders' Equity and Stock-Based Compensation | 3 Months Ended
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Apr. 01, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stockholders' Equity and Stock-Based Compensation | Note 11. Stockholders’ Equity and Stock-Based Compensation Options and Employee Stock Purchase Plan (“ESPP”) Awards The fair value of each option and ESPP award is estimated on the grant date using the Black-Scholes valuation model and the assumptions noted in the following table. The expected lives of options granted were calculated using the simplified method allowed by the Staff Accounting Bulletin No. 107, Share-Based Payment. The risk-free rates were based on the U.S Treasury rates in effect during the corresponding period of grant. The expected volatility was based on the historical volatility of the Company’s stock price. The dividend yield reflects that the Company has not paid any cash dividends since inception and does not intend to pay any cash dividends in the foreseeable future.
|  | Three Months Ended |
|  | April 1, 2017 |  |  | March 26, 2016 |
Employee Stock Purchase Plan: |  |  |  |  |  |  |  |
Expected life |  | 0.5 years |  |  | 0.5 years |
Volatility |  |  | 35.2% |  |  |  | 39.1% |
Risk free interest rate |  |  | 0.65% |  |  |  | 0.49% |
Dividends |  |  | — |  |  |  | — |
No stock options were awarded during the three months ended April 1, 2017 and March 26, 2016, respectively. A summary of activity of stock options during the three months ended April 1, 2017 is as follows:
|  | Number of Shares Outstanding (Options) |  |  | Weighted Average Exercise Price |
Options |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 440,545 |  |  | $ | 15.06 |
Exercised |  |  | (77,644 | ) |  | $ | 15.67 |
Cancelled |  |  | (438 | ) |  | $ | 15.60 |
Outstanding at April 1, 2017 |  |  | 362,463 |  |  | $ | 14.93 |
Exercisable at April 1, 2017 |  |  | 346,932 |  |  | $ | 14.82 |
The aggregate intrinsic value in the above table represents the total pretax intrinsic value, based on the Company’s closing stock price of $30.46 as of March 31, 2017, the last trading day of the quarter, which would have been received by the option holders had all option holders exercised their options as of that date. The total intrinsic value of options exercised during the three months ended April 1, 2017 and March 26, 2016 was $0.9 million and $3,000, respectively. Restricted Stock Units (“RSUs”) Time-based RSUs are valued using the market value of the Company’s common stock on the date of grant, assuming no expectation of dividends paid. A summary of activity for RSUs is as follows:
Summary of activity for RSUs |  | Number of RSUs |  |  | Weighted Average Fair Value |
Outstanding RSUs as of December 31, 2016 |  |  | 819,785 |  |  | $ | 16.79 |
Granted |  |  | 106,245 |  |  | $ | 26.13 |
Released |  |  | (103,249 | ) |  | $ | 16.18 |
Cancelled |  |  | (13,151 | ) |  | $ | 15.95 |
Outstanding RSUs as of April 1, 2017 |  |  | 809,630 |  |  | $ | 18.11 |
Market-Based Performance Stock Units (“PSUs”) In addition to granting RSUs that vest on the passage of time only, the Company granted PSUs to key executives. The PSUs vest in three equal tranches over one, two and three years based on the relative performance of the Company’s stock during those periods, compared to a peer group over the same period. If target stock price performance is achieved, 66.7% of the shares of the Company’s common stock subject to the PSUs will vest, consequently, up to a maximum of 100% of the shares subject to the PSUs will vest if the maximum stock price performance is achieved for each tranche. A summary of activity for PSUs is as follows:
Summary of activity for PSUs |  | Number of PSUs |  |  | Weighted Average Fair Value |
Outstanding PSUs as of December 31, 2016 |  |  | 107,500 |  |  | $ | 9.94 |
Granted |  |  | 59,550 |  |  |  | 26.75 |
Released |  |  | (38,500 | ) |  |  | 10.41 |
Cancelled |  |  | (4,000 | ) |  |  | 12.64 |
Outstanding PSUs as of April 1, 2017 |  |  | 124,550 |  |  | $ | 17.86 |
The preceding table reflects the maximum awards that can be achieved upon full vesting. Valuation of PSUs On the date of grant, the Company estimated the fair value of PSUs using a Monte Carlo simulation model. The assumptions for the valuation of PSUs are summarized as follows:
|  | 2017 Award |  |  | 2016 Award |
Grant Date Fair Value Per Share |  | $ | 26.75 |  |  | $ | 8.52 |
Weighted-average assumptions/inputs: |  |  |  |  |  |  |  |
Expected Dividend |  |  | — |  |  |  | — |
Range of risk-free interest rates |  |  | 1.40% |  |  |  | 0.92% |
Range of expected volatilities for peer group |  | 23%-62% |  |  | 22%-93% |
Stock-based Compensation Expense Stock-based compensation expense for all share-based payment awards made to the Company’s employees and directors pursuant to the employee stock option and employee stock purchase plans by function were as follows (in thousands):
|  | Three Months Ended |
|  | April 1, 2017 |  |  | March 26, 2016 |
Cost of products |  | $ | 197 |  |  | $ | 67 |
Cost of service |  |  | 145 |  |  |  | 104 |
Research and development |  |  | 398 |  |  |  | 285 |
Selling |  |  | 540 |  |  |  | 492 |
General and administrative |  |  | 884 |  |  |  | 741 |
Total stock-based compensation expense related to employee stock options and employee stock purchases |  | $ | 2,164 |  |  | $ | 1,689 |

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- Definition The entire disclosure for accounts comprising shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income, and compensation-related costs for equity-based compensation. Includes, but is not limited to, disclosure of policies, compensation plan details, equity-based arrangements to obtain goods and services, deferred compensation arrangements, and employee stock purchase plan details. + References No definition available. + Details
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