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Stock-based Compensation - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 13, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total grant date fair value for vested options |  |  |  | $ 3,700,000 | $ 2,200,000 |
Issuance of common stock in connection with acquisition (in shares) |  |  |  | 948,000 |  |
Stock-based compensation expense |  | $ 12,449,000 | $ 1,044,000 | $ 25,346,000 | $ 2,101,000 |
Shares of common stock reserved (in shares) |  | 78,953,000 |  | 78,953,000 |  | 63,284,000
Class A common stock | 2019 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized for issuance (in shares) |  | 66,661,953 |  | 66,661,953 |  |
Number of new shares authorized for issuance (in shares) |  | 29,335,000 |  | 29,335,000 |  |
Number of additional shares authorized for issuance (in shares) |  | 37,326,953 |  | 37,326,953 |  |
Number of shares available for issuance (in shares) |  | 26,289,059 |  | 26,289,059 |  |
Class A and Class B Common Stock | 2019 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Potential increase in number of shares authorized, as a percentage of total common stock outstanding |  |  |  | 5.00% |  |
Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average grant date fair value for options granted (in dollars per share) |  |  |  | $ 9.32 | $ 4.10 |
Unvested options exercisable (in shares) |  | 13,089,561 |  | 13,089,561 |  | 15,477,903
Options unrecognized stock-based compensation expense |  | $ 26,300,000 |  | $ 26,300,000 |  | $ 15,800,000
Weighted-average remaining vesting period |  |  |  | 3 years |  | 2 years 8 months 12 days
Liability for early exercise of stock options |  | $ 10,700,000 |  | $ 10,700,000 |  | $ 13,300,000
Number of unvested shares expected to be repurchased (in shares) |  |  |  | 4,825,368 |  | 5,945,083
Shares of common stock reserved (in shares) |  | 20,085,000 |  | 20,085,000 |  | 21,191,000
Options | 2010 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |
Expiration period |  |  |  | 10 years |  |
Options | Common Stock | 2010 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercise price of common stock, percentage of fair market value |  |  |  | 100.00% |  |
Options | Class A common stock | 2019 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cumulative shares granted (in shares) |  | 1,700,000 |  | 1,700,000 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 1,987,000 |  |
Vesting period |  |  |  | 4 years |  |
Weighted-average remaining vesting period |  |  |  | 3 years |  | 2 years 6 months
Stock-based compensation expense |  | $ 8,700,000 | 0 | $ 17,500,000 | $ 0 |
Unrecognized stock-based compensation expense |  | $ 73,400,000 |  | 73,400,000 |  | $ 53,100,000
Total grant date fair value for vested shares |  |  |  | $ 10,900,000 | 0 |
Shares of common stock reserved (in shares) |  | 7,158,000 |  | 7,158,000 |  | 7,175,000
Restricted Stock Units (RSUs) | Class A common stock | 2019 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cumulative shares granted (in shares) |  | 3,099,658 |  | 3,099,658 |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 841,000 |  |
Issuance of unvested restricted stock in connection with acquisition (in shares) |  |  |  | 841,000 |  |
Restricted stock issued in connection with acquisition, aggregate grant date fair value |  |  |  | $ 1,800,000 | 0 |
Stock-based compensation expense |  |  |  | 2,800,000 | 0 |
Unrecognized stock-based compensation expense |  | $ 11,600,000 | $ 0 | $ 11,600,000 | $ 0 |
Restricted Stock | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 2 years |  |
Vesting percentage |  |  |  | 77.80% |  |
Restricted Stock | Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Shares available for issuance under the ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of common stock reserved (in shares) |  | 5,449,000 |  | 5,449,000 |  | 5,870,000
Shares available for issuance under the ESPP | 2019 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average remaining vesting period |  |  |  | 4 months 24 days |  | 4 months 24 days
Unrecognized stock-based compensation expense |  | $ 1,700,000 |  | $ 1,700,000 |  | $ 1,000,000.0
Maximum ownership percentage threshold for participation | 5.00% |  |  |  |  |
Maximum contribution percentage per employee | 10.00% |  |  |  |  |
Shares available for issuance under the ESPP | Class A common stock | 2019 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of additional shares allowable under the plan (in shares) | 5,870,000 |  |  |  |  |
Purchase price of common stock, percentage of fair value | 85.00% |  |  |  |  |
Offering period | 6 months |  |  |  |  |
Purchase period | 6 months |  |  |  |  |
Maximum number of shares available for repurchase for each employee (in shares) | 1,500 |  |  |  |  |
Maximum value of shares available for repurchase for each employee | $ 25,000 |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  | 421,300 |  |
Shares available for issuance under the ESPP | Class A and Class B Common Stock | 2019 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Potential increase in number of share authorized, as a percentage of total common stock outstanding | 1.00% |  |  |  |  |

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