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Stock Based Compensation | 6 Months Ended
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Jan. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation 2011 Equity Incentive Plan In 2011, we adopted the 2011 Equity Incentive Plan (the “2011 Plan”). The 2011 Plan provided for the grant of stock-based awards to employees, directors, and nonemployees under terms and provisions established by the board of directors. The 2011 Plan allowed for the grant of incentive stock options or nonqualified stock options as well as restricted stock units, restricted stock, and stock appreciation rights. Only incentive and nonqualified stock options were granted under the 2011 Plan. Employee stock option awards generally vest 25% on the first anniversary of the grant date with the remaining shares subject to the option vesting ratably over the next three years. Options generally expire after 10 years. Effective upon our initial public offering in 2017, the 2011 Plan was replaced by the 2017 Incentive Plan. 2017 Incentive Plan In November 2017, our board of directors and stockholders adopted our 2017 Incentive Plan (the “2017 Plan”). The remaining shares available for issuance under our 2011 Plan became reserved for issuance under the 2017 Plan. Our 2017 Plan provides for the grant of Class A incentive stock options to employees, including employees of any parent or subsidiary, and for the grant of nonqualified stock options, stock appreciation rights, restricted stock (“RSU”) awards, restricted stock unit awards, performance stock awards, performance cash awards, and other forms of stock awards to employees, directors, and consultants, including employees and consultants of our subsidiaries. Employee stock option awards generally vest 25% on the first anniversary of the grant date with the remaining shares subject to the option vesting ratably over the next three years. Options generally expire after 10 years. RSU awards generally vest 25% on the first anniversary of the grant date with the remaining RSU awards vesting ratably over the next three years. The number of shares authorized for issuance under the 2017 Plan was 27,395,455 as of January 30, 2021. 2019 Inducement Plan In October 2019, our board of directors adopted our 2019 Inducement Plan (the “2019 Plan”). Our 2019 Plan provides for the grant of Class A nonqualified stock options and RSU awards to individuals who satisfy the standards for inducement grants under the relevant Nasdaq Stock Market rules. The number of shares authorized for issuance under the 2019 Plan was 4,750,000 as of January 30, 2021. Stock option activity under the 2011 Plan, 2017 Plan, and 2019 Plan is as follows:
|  |  |  | Options Outstanding
|  |  |  | Number of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value (in thousands)
Balance – August 1, 2020 |  |  |  | 6,817,196 |  |  | $ | 17.10 |  |  | 7.41 |  | $ | 40,252 |
Granted |  |  |  | 392,000 |  |  | $ | 56.50 |  |  |  |  |
Exercised |  |  |  | (1,601,726) |  |  | $ | 12.82 |  |  |  |  |
Cancelled |  |  |  | (1,054,611) |  |  | $ | 22.19 |  |  |  |  |
Balance – January 30, 2021 |  |  |  | 4,552,859 |  |  | $ | 20.82 |  |  | 7.33 |  | $ | 339,750 |
The aggregate intrinsic value is the difference between the current fair value of the underlying common stock and the exercise price for in-the-money stock options. The following table summarizes the restricted stock unit (“RSU”) award activity under the 2017 Plan and 2019 Plan:
| Unvested RSUs |  |  |  |
| Class A Common Stock |  | Weighted- Average Grant Date Fair Value |  |  |  |
Unvested at August 1, 2020 | 9,123,341 |  |  | $ | 20.11 |  |  |  |  |
Granted | 4,727,643 |  |  | $ | 31.87 |  |  |  |  |
Vested | (950,507) |  |  | $ | 22.05 |  |  |  |  |
Forfeited | (1,468,261) |  |  | $ | 21.62 |  |  |  |  |
Unvested at January 30, 2021 | 11,432,216 |  |  | $ | 24.62 |  |  |  |  |
Stock-Based Compensation Expense Stock-based compensation expense for employees was $24.8 million and $44.7 million for the three and six months ended January 30, 2021, respectively, and $15.8 million and $27.9 million for the three and six months ended February 1, 2020, respectively. Stock-based compensation expense is included in selling, general, and administrative expenses in our condensed consolidated statements of operations and comprehensive income. The weighted-average grant date fair value of options granted during the six months ended January 30, 2021, was $28.46 per share. The weighted-average grant date fair value of options granted during the six months ended February 1, 2020, was $11.59 per share. As of January 30, 2021, the total unrecognized compensation expense related to unvested options and RSUs, net of estimated forfeitures, was $275.3 million, which we expect to recognize over an estimated weighted average period of 2.6 years. We record stock-based compensation of stock options granted to employees by estimating the fair value of stock-based awards using the Black-Scholes option pricing model and amortizing the fair value of the stock-based awards granted over the applicable vesting period of the awards on a straight-line basis. The fair value of stock options granted to employees was estimated at the grant date using the Black-Scholes option-pricing model with the following assumptions:
| For the Three Months Ended |  | For the Six Months Ended
| January 30, 2021 |  | February 1, 2020 |  | January 30, 2021 |  | February 1, 2020
Expected term (in years) | 5.3 - 6.3 |  | 5.5 - 6.1 |  | 5.3 - 6.3 |  | 5.5 - 6.2
Volatility | 55.5 | % |  | 50.1% |  | 55.5% - 55.9% |  | 50.1% - 51.2%
Risk free interest rate | 0.4% - 0.5% |  | 1.6% |  | 0.3% - 0.5% |  | 1.6% - 1.7%
Dividend yield | — | % |  | — | % |  | — | % |  | — | %

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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