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Stockholders' Equity | 12 Months Ended
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Dec. 26, 2020
Equity [Abstract] |
Stockholders' Equity | Stockholders' Equity Preferred Stock We have authorized 10,000,000 shares of undesignated preferred stock, $0.001 par value, none of which is issued and outstanding. Our Board of Directors shall determine the rights, preferences, privileges and restrictions of the preferred stock, including dividends rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of any series. Common Stock Each share of common stock has the right to one vote. The holders of common stock are also entitled to receive dividends whenever funds are legally available and when declared by the Board of Directors, subject to the prior rights of holders, if any, of all classes of stock outstanding having priority rights as to dividends. No dividends have been declared or paid as of December 26, 2020. Common Stock Repurchase Program On October 26, 2020, our Board of Directors authorized a program to repurchase up to $50 million of outstanding common stock to offset potential dilution from issuances of common stock under our stock-based incentive plans. The share repurchase program will expire October 28, 2022. This repurchase program replaced the previous repurchase program that expired in February 2020 to purchase up to $25.0 million of outstanding common stock. During fiscal 2020, 2019 and 2018, we did not repurchase any shares. Equity Incentive Plan We currently grant equity-based awards under our Equity Incentive Plan, as amended (the "2012 Plan") which was approved by our stockholders. As amended, the 2012 Plan has authorized for issuance a total of 16.8 million shares, 6.0 million of which were available for grant as of December 26, 2020. RSUs granted under the 2012 Plan generally vest over three years in annual tranches, though we have granted, and will continue to grant, such awards that vest over a shorter term for employee retention purposes. The 2012 Plan provides that incentive stock options may be granted to our employees and nonqualified stock options, and all awards other than incentive stock options, may be granted to employees, directors and consultants. The exercise price of incentive stock options must be at least equal to the fair market value of our common stock on the date of grant. All restricted stock units and options granted under the 2012 Plan generally vest over three years and expire after seven years, unless otherwise determined by the Compensation Committee of the Board of Directors. Stock Options Stock option activity was as follows:
| Outstanding Options |  |
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value
Outstanding at December 28, 2019 | 361,769 |  |  | $ | 8.35 |  |  |  |  |
Options exercised | (255,769) |  |  | 8.35 |  |  |  |  |
Outstanding at December 26, 2020 | 106,000 |  |  | $ | 8.35 |  |  | 2.16 |  | $ | 3,627,900 |
Vested and expected to vest at December 26, 2020 | 106,000 |  |  | $ | 8.35 |  |  | 2.16 |  | $ | 3,627,900 |
Exercisable at December 26, 2020 | 106,000 |  |  | $ | 8.35 |  |  | 2.16 |  | $ | 3,627,900 |
Restricted Stock Units RSUs, including Performance Restricted Stock Units ("PRSUs") are converted into shares of our common stock upon vesting on a one-for-one basis. The vesting of RSUs is subject to the employee's continuing service. RSU activity was as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Restricted stock units at December 28, 2019 | 3,069,000 |  |  | $ | 14.30 |
Granted | 1,274,453 |  |  | 25.96 |
Vested | (1,453,378) |  |  | 13.72 |
Canceled | (49,153) |  |  | 15.70 |
Restricted stock units at December 26, 2020 | 2,840,922 |  |  | 19.80 |
The PRSUs granted in fiscal 2020, 2019 and 2018 listed below vest based on us achieving certain market performance criteria. The performance criteria are based on a metric called Total Shareholder Return ("TSR") for the performance period of three years, relative to the TSR of the companies identified as being part of the S&P Semiconductor Select Industry Index (FormFactor peer companies) as of a specific date. Of the 333,000 PRSUs granted in fiscal 2017, 78,333 shares were forfeited, resulting in 255,000 shares vesting in fiscal 2020. These shares achieved the maximum 125% TSR performance, which resulted in an additional 63,750 shares issued in fiscal 2020 related to the fiscal 2017 PRSU grant. PRSU grant activity was as follows:
|  | Fiscal Year Ended
|  | December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Grant Date |  | August 27, 2020 |  | June 4, 2019 |  | August 16, 2018
Performance period |  | July 1, 2020 - June 30, 2023 |  | July 1, 2019 - June 30, 2022 |  | July 1, 2018 - June 30, 2021
Number of shares |  | 258,000 |  | 273,000 |  | 318,100
TSR as-of date |  | August 27, 2020 |  | June 4, 2019 |  | August 16, 2018
Stock-based compensation |  | $6.9 million |  | $4.4 million |  | $4.7 million
Employee Stock Purchase Plan Our 2012 Employee Stock Purchase Plan (the "ESPP"), as amended, allows for the issuance of a total of 7,000,000 shares. The offering periods under the ESPP are 12 months commencing on February 1 of each calendar year and ending on January 31 of the subsequent calendar year, and a six-month fixed offering period commencing on August 1 of each calendar year and ending on January 31 of the subsequent calendar year. The 12-month offering period consists of two six-month purchase periods and the six-month offering period consists of one six-month purchase period. The price of the common stock purchased is 85% of the lesser of the fair market value of the common stock on the first day of the applicable offering period or the last day of each purchase period. During fiscal 2020, employees purchased 485,566 shares under this program at a weighted average exercise price of $16.47 per share, which represented a weighted average discount of $11.00 per share from the fair value of the stock purchased. As of December 26, 2020, 2,171,656 shares remained available for issuance.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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