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Stock-based compensation | 9 Months Ended
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Jun. 29, 2019
Share-based Payment Arrangement [Abstract] |
Stock-based compensation | Stock-based compensation In 2003, the Company’s board of directors (the “Board”) established the 2003 Stock Plan (as amended, the “2003 Plan”). In July 2018, the Board adopted the 2018 Equity Incentive Plan (the “2018 Plan”) and ceased granting awards under the 2003 Plan. The 2018 Plan became effective in connection with the IPO. Any remaining shares of common stock available for issuance under the 2003 Plan on the effective date of the 2018 Plan were added to the shares of common stock reserved for issuance under the 2018 Plan as of such date, and additional shares of common stock that would become available for issuance under the 2003 Plan in the future will instead become available for issuance under the 2018 Plan, as further discussed in the Annual Report. Stock options Pursuant to the 2018 Plan, the Company issues stock options to employees. The fair value of the stock options is based on the Company’s closing stock price on the trading day immediately prior to the date of grant. The option price, number of shares and grant date are determined at the discretion of the Board. For so long as the optionholder performs services for the Company, the options generally vest over 48 months, with cliff vesting after one year and generally vest on a monthly or quarterly basis thereafter, and are exercisable for a period not to exceed ten years from the date of grant. The summary of the Company’s stock option activity is as follows:
| Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
|  |  |  |  | (in years) |  | (in thousands)
Outstanding at September 29, 2018 | 48,504,182 |  |  | $ | 10.33 |  |  | 6.6 |  | $ | 276,959 |
Granted | 1,714,328 |  |  |  |  |  |  |  |
Exercised | (5,869,451 | ) |  |  |  |  |  |  |
Forfeited | (4,247,115 | ) |  |  |  |  |  |  |
Outstanding at June 29, 2019 | 40,101,944 |  |  | $ | 11.10 |  |  | 6.4 |  | $ | 82,902 |
At June 29, 2019 |  |  |  |  |  |  |
Options exercisable | 27,343,825 |  |  | $ | 9.62 |  |  | 5.4 |  | $ | 82,475 |
Options vested and expected to vest | 38,174,480 |  |  | $ | 10.93 |  |  | 6.3 |  | $ | 82,792 |
As of June 29, 2019 and September 29, 2018, the Company had $51.4 million and $71.5 million, respectively, of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted-average period of 2.2 and 2.6 years, respectively. Restricted stock units Pursuant to the 2018 Plan, the Company issues restricted stock units (“RSUs”) to employees. The fair value of RSUs is based on the Company's closing stock price on the trading day immediately preceding the date of grant. RSUs typically have an initial annual cliff vest and then vest quarterly over the service period, which is generally four years. The summary of the Company’s unvested RSU activity is as follows:
| Number of Units |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
|  |  |  |  | (in thousands)
Unvested at September 29, 2018 | — |  |  | $ | — |  |  | $ | — |
Granted | 7,369,802 |  |  |  |  |
Vested | (435,978 | ) |  |  |  |
Forfeited | (225,899 | ) |  |  |  |
Unvested at June 29, 2019 | 6,707,925 |  |  | $ | 11.31 |  |  | $ | 76,068 |
At June 29, 2019 |  |  |  |  |
Units expected to vest | 5,118,685 |  |  | $ | 11.32 |  |  | $ | 58,046 |
As of June 29, 2019, the Company had $55.1 million of unrecognized stock-based compensation expense related to their RSUs, which is expected to be recognized over a weighted-average period of 3.6 years. Stock-based compensation Total stock-based compensation expense by function category was as follows:
| Three Months Ended |  | Nine Months Ended
| June 29, 2019 |  | June 30, 2018 |  | June 29, 2019 |  | June 30, 2018
(In thousands) |  |  |  |  |  |  |
Cost of revenue | $ | 298 |  |  | $ | 49 |  |  | $ | 701 |  |  | $ | 156 |
Research and development | 4,904 |  |  | 3,651 |  |  | 12,792 |  |  | 10,417 |
Sales and marketing | 3,608 |  |  | 4,391 |  |  | 9,416 |  |  | 12,414 |
General and administrative | 4,598 |  |  | 2,242 |  |  | 10,616 |  |  | 6,410 |
Total stock-based compensation expense | $ | 13,408 |  |  | $ | 10,333 |  |  | $ | 33,525 |  |  | $ | 29,397 |

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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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