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Employee Benefit Plans - Stock Activity, Weighted Average Exercise Price (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Shares |  |  |
Options outstanding, beginning balance (in shares) | 23,013,590 |  |
Granted (in shares) | 3,509,549 | 3,221,892 | 2,679,667
Exercised (in shares) | (16,159,742) |  |
Forfeited (in shares) | (73,249) |  |
Expired (in shares) | (5,650) |  |
Options outstanding, end balance (in shares) | 10,284,498 | 23,013,590 |
Options exercisable (in shares) | 4,084,124 |  |
Options unvested (in shares) | 6,200,374 |  |
Weighted Average Exercise Price |  |  |
Options outstanding, beginning balance, weighted-average exercise price | $ 2.48 |  |
Granted, weighted-average exercise price | 12.79 |  |
Exercised, weighted-average exercise price | 2.55 |  |
Forfeited, weighted-average exercise price | 6.32 |  |
Expired, weighted-average exercise price | 4.78 |  |
Options outstanding, end balance, weighted-average exercise price | 5.78 | $ 2.48 |
Options exercisable, weighted-average exercise price | 2.31 |  |
Options unvested, weighted-average exercise price | $ 8.07 |  |
Stock option activity additional disclosures |  |  |
Options outstanding, weighted-average remaining contractual term | 7 years 9 months 18 days | 6 years 7 months 6 days |
Options exercisable, weighted-average remaining contractual term | 5 years 9 months 18 days |  |
Options unvested, weighted-average remaining contractual term | 9 years 1 month 6 days |  |
Options outstanding, aggregate intrinsic value | $ 289,316 | $ 22,277 |
Options exercisable, aggregate intrinsic value | 129,068 |  |
Options unvested, aggregate intrinsic value | $ 160,248 |  |
Weighted-average grant date fair value of options granted (per share) | $ 7.22 | $ 1.67 | $ 1.55
Unrecognized compensation cost | $ 8,100 |  |
Period for recognition | 3 years |  |
Fair value of stock options that vested during the period | $ 5,900 | $ 6,100 |

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- Definition Weighted average remaining contractual term for non-vested options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of cost to be recognized for option under share-based payment 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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