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Stock option plan and stock-based compensation (Tables) | 9 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock Option Activity | Stock option activity was as follows:
| Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Weighted Average Intrinsic Value
|  |  |  |  | (in years) |  | (in thousands)
Outstanding at September 30, 2017 | 45,817,252 |  |  | $ | 9.20 |  |  | 6.9 |  | $ | 199,663 |
Granted | 7,676,414 |  |  | $ | 15.09 |  |  |  |  |
Exercised | (1,735,750 | ) |  | $ | 3.31 |  |  |  |  |
Forfeited | (3,387,668 | ) |  | $ | 13.05 |  |  |  |  |
Outstanding at June 30, 2018 | 48,370,248 |  |  | $ | 10.08 |  |  | 6.7 |  | $ | 243,060 |
At June 30, 2018 |  |  |  |  |  |  |
Options exercisable | 30,582,952 |  |  | $ | 7.70 |  |  | 5.4 |  | $ | 226,453 |
Options vested and expected to vest | 45,413,361 |  |  | $ | 9.80 |  |  | 6.6 |  | $ | 240,964 |
Schedule of Stock-based Compensation Expense | Total stock-based compensation expense by function category was as follows:
| Three Months Ended |  | Nine Months Ended
| June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
(In thousands) |  |  |  |  |  |  |
Cost of revenue | $ | 49 |  |  | $ | 65 |  |  | $ | 156 |  |  | $ | 179 |
Research and development | 3,651 |  |  | 3,529 |  |  | 10,417 |  |  | 10,136 |
Sales and marketing | 4,391 |  |  | 3,899 |  |  | 12,414 |  |  | 11,172 |
General and administrative | 2,242 |  |  | 2,045 |  |  | 6,410 |  |  | 5,474 |
Total stock-based compensation expense | $ | 10,333 |  |  | $ | 9,538 |  |  | $ | 29,397 |  |  | $ | 26,961 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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