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Stock Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of Shares Outstanding Under the Plan |  |  |
Options granted (in shares) | 47,841,859 |  |
Stock Options |  |  |
Number of Shares Available for Issuance Under the Plan |  |  |
Balance at the beginning (in shares) | 2,880,358 | 3,855,385 |
Additional shares authorized (in shares) | 62,903,028 |  |
Options granted (in shares) | (36,074,010) |  |
Options exercised (in shares) | 0 |  |
Options canceled (in shares) | 5,791,227 | (975,027) |
Balance at the end (in shares) | 35,500,603 | 2,880,358 | 3,855,385
Number of Shares Outstanding Under the Plan |  |  |
Balance at the beginning (in shares) | 28,983,226 | 38,794,307 |
Options granted (in shares) | 35,732,754 |  |
Options exercised (in shares) | (20,138,817) |  |
Options canceled (in shares) | (6,172,670) | (9,811,081) |
Balance at the end (in shares) | 38,404,493 | 28,983,226 | 38,794,307
Exercisable at the end (in shares) | 14,248,234 | 15,225,162 |
Unvested at the end (in shares) | 24,156,259 | 13,758,064 |
Weighted-Average Exercise Price |  |  |
Balance at the beginning (in dollars per shares) | $ 0.19 | $ 0.14 |
Options granted (in dollars per shares) | 6.70 |  |
Options exercised (in dollars per shares) | 0.78 |  |
Options canceled (in dollars per shares) | 0.51 | 0.05 |
Balance at the end (in dollars per shares) | 5.89 | 0.19 | $ 0.14
Exercisable at the end (in dollars per shares) | 0.18 | 0.08 |
Unvested at the end (in dollars per shares) | $ 9.25 | $ 0.31 |
Weighted-Average Remaining Contractual Term (Years) and Aggregate Intrinsic Value |  |  |
Weighted average remaining contractual life, outstanding | 8 years 3 months 7 days | 7 years 8 months 1 day | 7 years 8 months 1 day
Exercisable at the end (in years) | 6 years 5 months 12 days | 6 years 10 months 6 days |
Unvested at the end (in years) | 9 years 4 months 2 days | 8 years 6 months 29 days |
Aggregate intrinsic value outstanding | $ 542,074 | $ 13,056 | $ 13,056
Exercisable at the end (in dollars) | $ 282,364 | $ 8,492 |
Unvested at the end (in dollars) | 259,710,000 | 4,564,000 |
Shares of restricted common stock issued upon the early exercise of the Executive grants | 13,300,000 | 8,200,000 |
Unrecognized stock-based compensation expense | $ 156,900 |  |
Unrecognized stock-based compensation expense, weighted-average period of recognition | 3 years 6 months 11 days |  |
Aggregate intrinsic value of options exercised | $ 89,900 | $ 1,400 | $ 500
Restricted stock units |  |  |
Number of Shares Outstanding Under the Plan |  |  |
Balance at the beginning (in shares) | 0 |  |
Options granted (in shares) | 341,256 |  |
Balance at the end (in shares) | 341,256 | 0 |
Restricted stock units | Weighted Average Grant Date Fair Value Per Share Member |  |  |
Weighted-Average Exercise Price |  |  |
Options granted (in dollars per shares) | $ 17.68 |  |
Unvested at the end (in dollars per shares) | $ 17.68 |  |

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