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Share-Based Compensation | 12 Months Ended
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Jan. 28, 2018
Share-based Compensation [Abstract] |
Stock-Based Compensation | Share-Based Compensation Financial Statement Effects and Presentation. The following table summarizes pre-tax share-based compensation included in the Statements of Income for fiscal years 2018, 2017 and 2016:
| Fiscal Year Ended
(in thousands) | January 28, 2018 |  | January 29, 2017 |  | January 31, 2016
Revenue offset (Warrant) | $ | 16,219 |  |  | $ | 5,396 |  |  | $ | — |
Cost of sales | 1,477 |  |  | 1,591 |  |  | 1,555 |
Selling, general and administrative | 22,423 |  |  | 18,019 |  |  | 10,055 |
Product development and engineering | 7,817 |  |  | 5,822 |  |  | 8,858 |
Share-based compensation | $ | 47,936 |  |  | $ | 30,828 |  |  | $ | 20,468 |
Net change in share-based compensation capitalized into inventory | $ | (414 | ) |  | $ | 38 |  |  | $ | (98 | )
Grant Date Fair Values and Underlying Assumptions: The Company uses the Black-Scholes pricing model to value stock options. The estimated fair value of restricted stock units, for which vesting is not linked to a market condition, is calculated based on the market price of the Company’s common stock on the date of grant. For restricted stock units that vest according to a market condition, the Company uses a Monte Carlo simulation model to value the award. The following table summarizes the assumptions used in the Black-Scholes model to determine the fair value of stock options granted in fiscal years 2018, 2017 and 2016:
| Fiscal Year Ended
| January 28, 2018 |  | January 29, 2017 |  | January 31, 2016
Expected lives, in years | 4.2 |  | 4.1 - 4.5 |  | 4.2 - 4.3
Estimated volatility | 31.7% |  | 31% - 32% |  | 29% - 32%
Dividend yield | — |  | — |  | —
Risk-free interest rate | 1.68% |  | 1.04% - 1.51% |  | 1.24% - 1.49%
Weighted average fair value on grant date | $10.70 |  | $5.71 |  | $6.08
The assumptions used in the Black-Scholes option pricing model were determined as follows:
• | Fair Value of Common Stock - The closing price on the date of the grant.
• | Expected Term - The expected term represents the period that our stock-based awards are expected to be outstanding.
• | Expected Volatility - The expected volatility was derived from the annualized volatility of the Company's closing stock price over the preceding three or four years depending upon the life of the option award.
• | Risk-Free Interest Rate - The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant for zero-coupon U.S. Treasury notes with maturities approximately equal to the expected term of the stock option grants.
• | Dividend Rate - We have never declared or paid any cash dividends and do not plan to pay cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero.
Stock Options. The Company has historically granted non-qualified stock options to both employees and non-employee directors. The fair value of these grants was measured on the grant date. The grant date for these awards is equal to the measurement date. These awards are valued as of the measurement date and recognized as an expense over the requisite vesting period (typic ally 3-4 years). T he number of shares authorized per the equity incentive plan is 17,031,653. The maximum contractual term of equity share options is ten years. The following table summarizes the activity for stock options for fiscal years 2018:
(in thousands, except for per share amounts) | Number of Shares |  | Weighted Average Exercise Price (per share) |  | Aggregate Intrinsic Value (1) |  | Number of Shares Exercisable |  | Weighted Average Contractual Term (years)
Balance at January 29, 2017 | 1,511 |  |  | 24.79 |  |  | 13,503 |  |  | 759 |  |
Options granted | 135 |  |  | 37.70 |  |  |  |  |  |  |
Options exercised | (275 | ) |  | 24.27 |  |  | 3,446 |  |  |  |  |
Options cancelled/forfeited | (26 | ) |  | 26.22 |  |  |  |  |  |  |
Balance at January 28, 2018 | 1,345 |  |  | $ | 26.17 |  |  | $ | 13,953 |  |  | 807 |  |
Exercisable at January 29, 2018 | 807 |  |  | $ | 26.61 |  |  | $ | 7,941 |  |  |  |  | 2.1
Vested and expected to vest after January 29, 2018 | 1,345 |  |  | $ | 26.17 |  |  | $ | 13,953 |  |  |  |  | 3.0
(1) The aggregate intrinsic value of stock options vested and exercisable and vested and expected to vest as of January 28, 2018 is calculated based on the difference between the exercise price and the closing price $36.45 of the Company's common stock on January 26, 2018. The aggregate unrecognized compensation as of January 28, 2018 is $2.6 million to be recognized over 1.9 years. The following table summarizes information regarding unvested stock option awards at January 28, 2018:
(in thousands, except for per share amounts) | Number of Shares |  | Weighted Average Exercise Price (per share) |  | Weighted Average Grant Date Fair Value (per share)
Balance at January 29, 2017 | 749 |  |  | 22.66 |  |  | 6.29 |
Options granted | 135 |  |  | 37.70 |  |  | 10.70 |
Options vested | (324 | ) |  | 23.92 |  |  | 6.71 |
Options forfeited | (26 | ) |  | 26.23 |  |  | 7.32 |
Balance at January 28, 2018 | 534 |  |  | $ | 25.50 |  |  | $ | 7.10 |
Performance-Based Units. The Company grants performance-based restricted stock units to select employees. These awards have a performance condition in addition to a service condition. Prior to fiscal year 2018, the Company granted performance-based restricted stock units with performance metrics that were based on a pre-defined cumulative three-year performance of the Company’s revenue and non-GAAP operating income measured against internal goals. For these awards, the performance was tied to the Company’s performance in the grant year and the succeeding two fiscal years. The performance award recipients must be employed for the entire three-year period, which is the explicit service and requisite service period, and be an active employee at the time of vesting of the awards (cliff vesting at the end of the third year). Under the terms of these awards, assuming the highest performance level of 200% with no cancellations due to forfeitures, the maximum number of shares that can be earned would be 219,000 shares and an additional 219,000 shares would be settled in cash. The Company would have a liability accrued under "Other liabilities" within the Balance Sheets equal to the value of 219,000 shares on the settlement date, which would be settled in cash. Only cash performance-based restricted stock unit awards are classified as liabilities and the value of these awards is re-measured at each reporting date. At January 28, 2018, the performance metrics associated with the outstanding awards issued in fiscal year 2017 is expected to be met at a level which would result in a grant at 190% of target. The performance-based restricted stock units are valued as of the measurement date and expense is recognized on a straight line basis for the awards expected to vest based on the probability of attainment of the performance condition for each separately vesting portion of the award. Beginning in fiscal year 2018, the Company granted 215,857 performance-based restricted stock units that have a pre-defined market condition and service condition. These grants are accounted for as equity awards. The market condition is determined based upon the Company’s total stockholder return ("TSR") benchmarked against the TSR of the S&P SPDR Semiconductor ETF (NYSE:XSD) over a one, two and three-year performance period (one-third of the awards vesting each performance period). Award recipients must be employed for the entire performance period and be an active employee at the time of vesting. The Company used a Monte Carlo simulation to determine the grant-date fair value for these awards, which takes into consideration the possible outcomes pertaining to the TSR market condition. The grant-date fair value per unit of the awards granted in the first quarter of fiscal year 2018 for each one, two and three-year performance period is $38.01, $39.76 and $40.89, respectively. The portion of the awards that vested at the end of fiscal year 2018 reflected a performance achievement of 58.2% of target. At January 28, 2018, the market metrics associated with the outstanding awards issued in fiscal year 2018 is expected to be met at a level which would result in a performance achievement of 58.2% of target. The following table summarizes the activity for performance-based restricted stock units for fiscal years 2018 and 2017:
|  |  | Subject to Share Settlement |  | Subject to Cash Settlement |  | Weighted Average Grant Date
(in thousands, except for per share amounts) | Total Units |  | Units |  | Units |  | Recorded Liability |  | Fair Value (per share)
Balance at January 29, 2017 | 383 |  |  | 195 |  |  | 188 |  |  | $ | 1,677 |  |  | 22.31 |
Performance units granted | 216 |  |  | 216 |  |  | — |  |  |  |  | 39.55 |
Performance units vested | (42 | ) |  | (42 | ) |  | — |  |  | — |  |  | 38.01 |
Performance units cancelled/forfeited | (194 | ) |  | (114 | ) |  | (80 | ) |  |  |  | 30.07 |
Change in liability |  |  | — |  |  |  |  | 4,791 |  |  |
Balance at January 28, 2018 | 363 |  |  | 255 |  |  | 108 |  |  | $ | 6,468 |  |  | $ | 26.58 |
The liability associated with performance-based restricted stock units increased by $4.8 million in fiscal year 2018 due to the re-measurement adjustments and changes in the expected performance results. The aggregate unrecognized compensation as of January 28, 2018 is $5.9 million which will be recognized over 1.2 years. Market Performance Restricted Stock Units. On February 26, 2014, the Company granted its CEO restricted stock units with a market performance condition. The award is eligible to vest during the period commencing February 26, 2014 and ending February 26, 2019 (the "Performance Period") as follows: 30% of the restricted stock units covered by the award will vest if, during any consecutive 120 calendar day period that commences and ends during the Performance Period, the average per-share closing price of the Company’s common stock equals or exceeds $35.00 ("Tranche 1") and the award will vest in full if, during any consecutive 120 calendar day period that commences and ends during the Performance Period, the average per-share closing price of the Company’s common stock equals or exceeds $40.00 ("Tranche 2"). The award will also vest if a majority change in control of the Company occurs during the Performance Period and, in connection with such event, the Company’s stockholders become entitled to receive per-share consideration having a value equal to or greater than $40.00. The fair value of the awards was determined to be $17.26 and $14.88 for Tranche 1 and Tranche 2, respectively, on the grant date by application of the Monte Carlo simulation model. These awards were fully expensed prior to fiscal year 2018. The following tables summarize the assumptions used in the Monte Carlo simulation model to determine the fair value of restricted stock units granted in fiscal year 2015 for both Tranche 1 and Tranche 2.
| January 25, 2015
| Tranche 1 |  | Tranche 2
Expected life, in years | 1.6 |  | 2.1
Estimated volatility | 34% |  | 34%
Dividend yield | —% |  | —%
Risk-free interest rate | 1.5% |  | 1.5%
Weighted average fair value on grant date | $17.26 |  | $14.88
The following table summarizes the activity for the market performance restricted stock units for the fiscal year ended January 28, 2018:
(in thousands, except for per share amounts) | Total Units |  | Weighted Average Grant Date Fair Value (per unit)
Balance at January 29, 2017 | 220 |  |  | $ | 15.59 |
Market performance units granted | — |  |  | — |
Market performance units vested | (66 | ) |  | 17.26 |
Market performance units cancelled/forfeited | — |  |  | — |
Balance at January 28, 2018 | 154 |  |  | $ | 14.88 |
Restricted Stock Units, Employees. The Company grants restricted stock units to employees which are expected to be settled with shares of the Company's common stock. The grant date for these awards is equal to the measurement date. These awards are valued as of the measurement date and recognized as an expense over the requisite vesting period (typic ally 4 ye ars).
(in thousands, except for per share amounts) | Restricted Stock Units, Stock Grants, and Stock Units |  | Performance Shares (1)
| 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Units granted | 983 |  |  | 1,228 |  |  | 1,032 |  |  | 216 |  |  | 231 |  |  | 235 |
Weighted-average grant date fair value | 36.96 |  |  | 22.12 |  |  | 20.79 |  |  | 39.55 |  |  | 17.51 |  |  | 28.60 |
(1) Restricted stock units granted includes awards that will be cash settled of 0 units in fiscal year 2018, 115,500 units in fiscal year 2017, and 90,500 units in fiscal year 2016. The following table is a summary of the status of non-vested restricted stock unit awards as of January 28, 2018 and changes during the year.
| Restricted Stock Units, Stock Grants, and Stock Units | Performance Shares
(in thousands, except for per share amounts) | Shares |  | Weighted Average Grant Date Fair Value (per unit) |  | Shares |  | Weighted Average Grant Date Fair Value (per unit)
Nonvested at January 29, 2017 | 2,141 |  |  | $ | 22.54 |  |  | 383 |  |  | $ | 22.31 |
Granted | 983 |  |  | $ | 36.96 |  |  | 216 |  |  | $ | 39.55 |
Vested | (792 | ) |  | $ | 23.41 |  |  | (42 | ) |  | $ | 38.01 |
Forfeited | (157 | ) |  | $ | 27.03 |  |  | (194 | ) |  | $ | 30.07 |
Nonvested at January 28, 2018 | 2,175 |  |  | $ | 28.42 |  |  | 363 |  |  | $ | 26.58 |
The aggregate unrecognized compensation for the non-vested restricted stock units and performance shares as of January 28, 2018 is $47.5 million and $5.9 million, respectively, which will be recognized over 2.3 and 1.2 years, respectively. Restricted Stock Units, Cash-Settled, Non-Employee Directors. The Company maintains a compensation program pursuant to which restricted stock units are granted to the Company’s directors that are not employed by the Company or any of its subsidiaries. In June 2015, the Company changed its director compensation program so that a portion of the stock units granted under the program would be settled in cash and a portion would be settled in shares of the Company's common stock. Restricted stock units awarded under the program are scheduled to vest on the earlier of (i) one year after the grant date or (ii) the day immediately preceding the annual meeting of shareholders in the year following the grant. The portion of a restricted stock unit award under the program that is to be settled in cash will, subject to vesting, be settled when the director who received the award separates from the board of directors. The portion of a restricted stock unit award under the program that is to be settled in shares of stock will, subject to vesting, be settled promptly following vesting. There were no changes to the terms and conditions of the existing awards. The restricted stock units that are to be settled in cash are accounted for as liabilities. Because these awards are not typically settled until a non-employee director’s separation from service, the value of these awards is re-measured at the end of each reporting period until settlement. As of January 28, 2018, the total number of vested but unsettled restricted stock units for non-employee directors is 197,313. As of January 28, 2018, $7.5 million of the liability associated with these awards is included in "Other long-term liabilities" within the Balance Sheets. Restricted Stock Units, Stock Settled, Non-Employee Directors. As a result of the June 2015 changes to the Company’s director compensation program, beginning in July 2015, the Company began granting new restricted stock units to non-employee Directors which are expected to be settled with shares of the Company's common stock at the time of vesting. The grant date for these awards is equal to the measurement date. These awards are valued as of the measurement date and recognized as an expense over the requisite vesting period (typically one year). Modification of Awards. On December 19, 2014 and August 17, 2015, the Company modified the equity awards of certain executive officers by providing for the acceleration of vesting upon termination of their employment in certain circumstances in connection with a change in control of the Company. The awards are not considered probable of vesting and the Company will continue to evaluate the probability going forward. These modifications impacted the stock awards of 12 executive employees and resulted in no incremental compensation cost for the fiscal year ended January 28, 2018 since it is not considered probable as of this date that a change of control will occur. Warrant. On October 5, 2016 the Company issued a warrant (the "Warrant") to Comcast Cable Communications Management LLC ("Comcast") to purchase up to 1,086,957 shares (the "Warrant Shares") of the Company’s common stock, par value $0.01 per share, representing a total of $30.0 million of common stock based on the average closing price over the 10-trading day period ended October 4, 2016, at an exercise price of $0.01 per Warrant Share. The Warrant provides for net share settlement that, if elected by Comcast, will reduce the number of Warrant Shares issued upon exercise to reflect net settlement of the exercise price. Comcast may also request cash settlement of the Warrant upon exercise in lieu of the issuance of Warrant Shares; however, such cash settlement is at the sole and absolute discretion of the Company. The Warrant vested 10% on its issuance, and the remainder vests based on the achievement during the subsequent 30-month period ("Milestone Period") by Comcast (or its designee) of certain milestones related to the deployment of a LoRaWAN™-based network in cities around the country. The number of Warrant Shares are subject to customary adjustment provisions for stock split, reclassification, reorganization, consolidation, merger, and similar transactions. The Warrant has a term of seven years from October 5, 2016. The Warrant was issued by the Company to Comcast in connection with an agreement between the parties regarding the intended trial deployment by Comcast of a low-power wide-area Network ("LPWAN") in the United States, based on the Company’s LoRa® devices and wireless radio frequency technology. The Warrant is accounted for as equity. The cost of the Warrant is recognized as an offset to net sales over the respective performance period which is expected to be completed by April 2018. The Warrant consists of five performance tranches. The cost associated with each tranche is recognized based on the fair value at each reporting date until vesting which is the measurement date. The underlying Warrant Shares issued to Comcast in fiscal year 2017, which amounted to 978 shares at a weighted average grant date fair value of $27.74, had aggregate unrecognized compensation of $20.6 million as of January 28, 2018. During fiscal year 2018, 109,000 shares underlying the Warrant vested and such portion of the Warrant for the underlying 109,000 shares has been exercised. The Warrant has a contractual life of seven years. Given the nominal exercise price of the Warrant Share, the Company valued the awards using the closing price of the Company’s stock on the measurement date for shares that have vested and the fair value on the Balance Sheets date for the other shares.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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