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Stockholders' Equity (Deficit) (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders' Equity Note [Abstract] |
Common Stock Reserved for Future Issuance | The Company has reserved the following shares of common stock for future issuance:
| December 31, 2021 |  |  | December 31, 2020 |
Series A redeemable convertible preferred stock |  | - |  |  |  | 34,911,252 |
Series B redeemable convertible preferred stock |  | - |  |  |  | 24,948,780 |
Series C redeemable convertible preferred stock |  | - |  |  |  | 18,657,756 |
Series D redeemable convertible preferred stock |  | - |  |  |  | 12,106,303 |
Series E redeemable convertible preferred stock |  | - |  |  |  | 24,653,759 |
Convertible founder stock |  | - |  |  |  | 635,818 |
2014 Stock Plan: |  |  |  |  |
Options outstanding |  | 61,903,883 |  |  |  | 71,213,150 |
Restricted stock units outstanding |  | 3,495,540 |  |  |  | - |
Remaining shares available for future issuance under the 2014 Plan |  | - |  |  |  | 4,722,481 |
2021 Equity Incentive Plan: |  |  |  |  |
Options outstanding |  | 22,500 |  |  |  | - |
Restricted stock units outstanding |  | 2,938,968 |  |  |  | - |
Remaining shares available for future issuance under the 2021 Plan |  | 32,797,245 |  |  |  | - |
2021 Employee Stock Purchase Plan |  | 5,162,575 |  |  |  | - |
Total |  | 106,320,711 |  |  |  | 191,849,299 |
Summary of Stock Equity Award Activity | The following table summarizes stock equity award activity and activity regarding shares available for grant under the 2014 Plan and the 2021 Plan:
|  |  |  |  | Equity Awards Outstanding |
|  | Shares Available for Grant |  |  | Outstanding Stock Options |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Balance as of January 1, 2019 |  |  | 5,645,652 |  |  |  | 48,361,074 |  |  | $ | 1.12 |  |  |  | 8.71 |  |  | $ | 98,241 |
Increase in authorized shares |  |  | 23,873,281 |  |  |  | - |  |  | $ | - |  |  |  |  |  |  |
Stock options granted |  |  | (32,867,335 | ) |  |  | 32,867,335 |  |  | $ | 3.24 |  |  |  |  |  |  |
Stock options exercised |  |  | - |  |  |  | (9,228,205 | ) |  | $ | 1.47 |  |  |  |  |  |  |
Stock options forfeited or expired |  |  | 4,413,648 |  |  |  | (4,413,648 | ) |  | $ | 1.78 |  |  |  |  |  |  |
Repurchases of unvested common stock |  |  | 167,628 |  |  |  | - |  |  | $ | - |  |  |  |  |  |  |
Balance as of December 31, 2019 |  |  | 1,232,874 |  |  |  | 67,586,556 |  |  | $ | 2.06 |  |  |  | 8.54 |  |  | $ | 202,315 |
Increase in authorized shares |  |  | 17,927,565 |  |  |  | - |  |  | $ | - |  |  |  |  |  |  |
Stock options granted |  |  | (22,829,471 | ) |  |  | 22,829,471 |  |  | $ | 6.20 |  |  |  |  |  |  |
Stock options exercised |  |  | - |  |  |  | (10,865,786 | ) |  | $ | 1.58 |  |  |  |  |  |  |
Stock options forfeited or expired |  |  | 8,337,091 |  |  |  | (8,337,091 | ) |  | $ | 2.65 |  |  |  |  |  |  |
Repurchases of unvested common stock |  |  | 54,422 |  |  |  | - |  |  | $ | - |  |  |  |  |  |  |
Balance as of December 31, 2020 |  |  | 4,722,481 |  |  |  | 71,213,150 |  |  | $ | 3.39 |  |  |  | 8.26 |  |  | $ | 677,503 |
Increase in authorized shares |  |  | 48,412,876 |  |  |  | - |  |  | $ | - |  |  |  |  |  |  |
Stock options granted |  |  | (17,232,871 | ) |  |  | 17,232,871 |  |  | $ | 16.38 |  |  |  |  |  |  |
Stock options exercised |  |  | - |  |  |  | (22,730,337 | ) |  | $ | 3.13 |  |  |  |  |  |  |
Stock options forfeited or expired |  |  | 3,789,301 |  |  |  | (3,789,301 | ) |  | $ | 5.31 |  |  |  |  |  |  |
Repurchases of unvested common stock |  |  | 188,460 |  |  |  | - |  |  | $ | - |  |  |  |  |  |  |
RSUs granted |  |  | (7,215,043 | ) |  |  | - |  |  | $ | - |  |  |  |  |  |  |
RSUs forfeited or cancelled |  |  | 132,041 |  |  |  | - |  |  | $ | - |  |  |  |  |  |  |
Balance as of December 31, 2021 |  |  | 32,797,245 |  |  |  | 61,926,383 |  |  | $ | 6.97 |  |  |  | 7.88 |  |  | $ | 4,289,643 |
Vested as of December 31, 2021 |  |  |  |  |  | 22,294,417 |  |  | $ | 3.25 |  |  |  | 6.88 |  |  | $ | 1,627,213 |
Vested and expected to vest as of December 31, 2021 |  |  |  |  |  | 61,926,383 |  |  | $ | 6.97 |  |  |  | 7.88 |  |  | $ | 4,289,643 |
Schedule of Restricted Stock Unit Activity | The following table summarizes RSU activity under the 2014 Plan and the 2021 Plan:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |
Unvested balances as of January 1, 2021 |  |  | - |  |  | $ | - |
RSUs granted |  |  | 7,215,043 |  |  | $ | 44.87 |
RSUs vested |  |  | (648,494 | ) |  | $ | 34.25 |
RSUs forfeited or cancelled |  |  | (132,041 | ) |  | $ | 41.51 |
Unvested balances as of December 31, 2021 |  |  | 6,434,508 |  |  | $ | 46.01 |
The total grant-date fair value of RSUs vested was $22.2 million during the year ended December 31, 2021.
Schedule of Weighted-Average Assumptions to Estimate Fair Value of Stock Options | The fair value of stock options granted was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
| Year Ended December 31, |
| 2021 |  |  | 2020 |  |  | 2019 |
Expected term (in years) |  | 6.17 |  |  |  | 6.17 |  |  |  | 6.04 |
Expected volatility |  | 66.3 | % |  |  | 68.3 | % |  |  | 59.0 | %
Risk-free interest rate |  | 1.1 | % |  |  | 0.5 | % |  |  | 1.8 | %
Expected dividend yield |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Schedule of Weighted-Average Assumptions to Estimate Fair Value of Employee Stock Purchase Rights | The fair value of employee stock purchase rights for the initial offering period under the 2021 ESPP was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
| Year Ended December 31, 2021
Expected term (in years) | 0.63 - 1.12
Expected volatility | 54.6% - 56.7%
Risk-free interest rate | 0.1%
Expected dividend yield | 0%
Summary of Stock-Based Compensation Expense | Total stock-based compensation expense was as follows (in thousands):
| Year Ended December 31, |
| 2021 |  |  | 2020 |  |  | 2019 |
Cost of revenue - subscription | $ | 12,571 |  |  | $ | 2,572 |  |  | $ | 1,161 |
Cost of revenue - services |  | 5,418 |  |  |  | 1,745 |  |  |  | 994 |
Research and development |  | 49,051 |  |  |  | 33,755 |  |  |  | 6,268 |
Sales and marketing |  | 55,506 |  |  |  | 14,734 |  |  |  | 6,545 |
General and administrative |  | 33,078 |  |  |  | 90,535 |  |  |  | 3,649 |
Stock-based compensation, net of amounts capitalized | $ | 155,624 |  |  | $ | 143,341 |  |  | $ | 18,617 |
Capitalized stock-based compensation |  | 2,625 |  |  |  | 547 |  |  |  | 69 |
Total stock-based compensation | $ | 158,249 |  |  | $ | 143,888 |  |  | $ | 18,686 |

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