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Shareholders' Equity - Summary of Stock Option and RSU Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Stock options outstanding, beginning balance (in shares) | 3,812,242 | 5,476,790 |
Stock options granted (in shares) | 258,163 | 488,485 |
Stock options exercised (in shares) | (1,530,759) | (2,084,063) |
Stock options forfeited (in shares) | (50,369) | (68,970) |
Stock options outstanding, ending balance (in shares) | 2,489,277 | 3,812,242 | 5,476,790
Stock options exercisable (in shares) | 1,852,236 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |
Weighted average exercise price of stock options outstanding, beginning (in dollars per share) | $ 103.76 | $ 54.59 | $ 32.96
Weighted average exercise price of stock options granted (in dollars per share) | 505.69 | 165.03 |
Weighted average exercise price of stock options exercised (in dollars per share) | 46.26 | 23.19 |
Weighted average exercise price of stock options forfeited (in dollars per share) | 189.56 | 68.24 |
Weighted average exercise price of stock options outstanding, ending (in dollars per share) | 103.76 | $ 54.59 | $ 32.96
Weighted average exercise price of stock options exercisable (in dollars per share) | $ 44.61 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Remaining Contractual Term [Abstract] |  |  |
Remaining contractual term of stock options outstanding, beginning | 5 years 5 months 12 days | 6 years 1 month 20 days | 6 years 2 months 23 days
Remaining contractual term of stock options outstanding, ending | 5 years 5 months 12 days | 6 years 1 month 20 days | 6 years 2 months 23 days
Remaining contractual term of stock options exercisable | 4 years 7 months 28 days | 4 years 7 months 28 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] |  |  |
Aggregate intrinsic value of stock options outstanding, beginning | $ 2,559,442 | $ 1,307,565 | $ 577,731
Aggregate intrinsic value of stock options outstanding, ending | 2,559,442 | $ 1,307,565 | $ 577,731
Aggregate intrinsic value of stock exercisable | $ 2,014,011 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Weighted average grant date fair value of stock options outstanding, beginning (in dollars per share) | $ 0 | $ 0 | $ 0
Weighted average grant date fair value of stock options granted (in dollars per share) | 197.26 |  | 126.93
Weighted average grant date fair value of stock options outstanding, ending (in dollars per share) | $ 0 | $ 0 | $ 0
Legacy Option Plan | Class B Multiple Voting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Stock options exercisable (in shares) | 992,376 |  |
Stock Option Plan | Class A Subordinate Voting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Stock options exercisable (in shares) | 1,441,791 |  |
6 River Systems 2016 Amended and Restated Stock Option and Grant Plan | Class A Subordinate Voting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Stock options exercisable (in shares) | 55,110 |  |
Net income (loss) per share: |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Outstanding [Roll Forward] |  |  |
RSUs outstanding, beginning (in shares) | 1,939,918 | 2,473,665 |
RSUs granted (in shares) | 473,697 | 888,991 |
RSUs settled (in shares) | (1,176,637) | (1,252,250) |
RSUs forfeited (in shares) | (124,011) | (170,488) |
RSUs outstanding, ending (in shares) | 1,112,967 | 1,939,918 | 2,473,665
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Weighted average grant date fair value of RSUs outstanding, beginning (in dollars per share) | $ 377.08 | $ 159.13 | $ 92.40
Weighted average grant date fair value of RSUs granted (in dollars per share) | 645.99 | 232.09 |
Weighted average grant date fair value of RSUs settled (in dollars per share) | 138.04 | 84.98 |
Weighted average grant date fair value of RSUs settled (in dollars per share) | 262.93 | 116.06 |
Weighted average grant date fair value of RSUs outstanding, ending (in dollars per share) | $ 377.08 | $ 159.13 | $ 92.40

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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