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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 19, 2021 | Apr. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | May 14, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total remaining stock-based compensation expense for unvested stock options |  |  | $ 6,100 |  | $ 6,100 |  |  |
Stock based compensation, weighted average period of recognition |  |  |  |  | 1 year 2 months 12 days |  |  |
Issuance of common stock upon exercise of options (in shares) |  |  |  |  | 115,000 |  |  |
Options vested during period (in shares) |  | 50,000 |  |  |  |  |  |
Nonvested options cancelled (in shares) |  | 100,000 |  |  |  |  |  |
Total stock-based compensation |  |  | $ 64,366 | $ 1,346 | $ 65,592 | $ 3,304 |  |
Equity Incentive Plan 2021 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares initially reserved for issuance (in shares) |  |  |  |  |  |  | 10,700,000 |
Shares reserved for issuance as a percent of common stock issued and outstanding (as a percent) |  |  |  |  |  |  | 5.00% |
Stock granted under 2021 Plan (in shares) |  |  |  |  | 0 |  |  |
Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock based compensation, weighted average period of recognition |  |  |  |  | 1 year 6 months |  |  |
Restricted stock units granted (in shares) |  | 32,500 |  |  | 3,010,000 |  |  |
Service period |  |  |  |  | 4 years |  |  |
RSUs outstanding (in shares) | 6,900,000 |  | 5,977,000 |  | 5,977,000 |  |  | 5,451,000
Fair value of RSUs (in dollars per share) | $ 25.04 |  |  |  |  |  |  |
Value of RSUs | $ 172,600 |  |  |  |  |  |  |
Total stock-based compensation |  |  | $ 63,400 |  | $ 63,400 |  |  |
Weighted average grant date fair value (in dollars per share) |  |  | $ 14.08 |  | $ 14.08 |  |  | $ 5.75
Unrecognized stock based compensation expense |  |  | $ 108,200 |  | $ 108,200 |  |  |
Restricted stock units | Chief Executive Officer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock based compensation, weighted average period of recognition |  |  |  |  | 3 years 10 months 24 days |  |  |
Restricted stock units granted (in shares) | 1,400,000 |  |  |  |  |  |  |
Total stock-based compensation |  |  | 600 |  | $ 600 |  |  |
Trading window (in days) | 30 days |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |  |
Aggregate stock based compensation expense over derived service period | $ 22,800 |  |  |  |  |  |  |
Unrecognized stock based compensation expense |  |  | $ 22,200 |  | $ 22,200 |  |  |
Restricted stock units | Chief Executive Officer | Monte Carlo Simulation |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Service period |  |  |  |  | 4 years 1 month 6 days |  |  |
Fair value assumptions, expected dividend yield |  |  |  |  | 0.00% |  |  |
Fair value assumptions, expected term |  |  |  |  | 10 years |  |  |
Fair value assumptions, estimated volatility (as a percent) |  |  |  |  | 59.00% |  |  |
Fair value assumptions, risk-free rate (as a percent) |  |  |  |  | 2.00% |  |  |
Weighted average grant date fair value (in dollars per share) |  |  | $ 16.34 |  | $ 16.34 |  |  |
Restricted stock units | Chief Executive Officer | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Service period |  |  |  |  | 1 year |  |  |
RSUs vested in period, amount per share (in dollars per share) | $ 67.61 |  |  |  |  |  |  |
Restricted stock units | Chief Executive Officer | Minimum | Monte Carlo Simulation |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Service period |  |  |  |  | 3 years 2 months 12 days |  |  |
Restricted stock units | Chief Executive Officer | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Service period |  |  |  |  | 5 years |  |  |
RSUs vested in period, amount per share (in dollars per share) | $ 157.75 |  |  |  |  |  |  |
Restricted stock units | Chief Executive Officer | Maximum | Monte Carlo Simulation |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Service period |  |  |  |  | 5 years |  |  |

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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 The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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