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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Number of shares |  |  |  |
Outstanding as at beginning of period (in shares) |  | 4,776,908 |  |
Granted (in shares) |  | 1,031,733 | 0 |
Exercised (in shares) | (135,525) | (156,385) |  |
Forfeited (in shares) |  | (87,668) |  |
Outstanding as at end of period (in shares) |  | 5,564,588 |  | 4,776,908
Options vested and exercisable as at end of period (in shares) |  | 1,053,721 |  |
Options expected to vest as at end of period (in shares) |  | 4,510,867 |  |
Weighted Average Exercise Price |  |  |  |
Outstanding as at beginning of period (in dollars per share) |  | $ 10.83 |  |
Granted (in dollars per share) |  | 35.88 |  |
Exercised (in dollars per share) |  | 3.38 |  |
Forfeited (in dollars per share) |  | 22.39 |  |
Outstanding at end of period (in dollars per share) |  | 15.50 |  | $ 10.83
Options vested and exercisable as at end of period (in dollars per share) |  | 7.38 |  |
Options expected to vest as at end of period (in dollars per share) |  | $ 17.39 |  |
Weighted Average Remaining Contractual Life |  |  |  |
Weighted Average Remaining Contractual Life of outstanding options (in years) |  | 9 years 10 days |  | 9 years 8 months 1 day
Weighted Average Remaining Contractual Life of granted options (in years) |  | 9 years 3 months 21 days |  |
Weighted Average Remaining Contractual Life of vested and exercisable options (in years) |  | 8 years 6 months 25 days |  |
Weighted Average Remaining Contractual Life of expected to vest options (in years) |  | 9 years 1 month 20 days |  |
Intrinsic Value of outstanding options |  | $ 71,759 |  | $ 177,962
Intrinsic Value of vested and exercisable options |  | 21,315 |  |
Intrinsic Value of expected to vest options |  | $ 54,999 |  |
Unvested early exercised stock options |  | 53,588 |  |

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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