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Equity Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of Share-based Payment Arrangement, Option, Activity | Stock option activity under the Plan and the 2017 Plan was as follows:
| Stock options outstanding |
Number of shares |  | Weighted average exercise price |  | Weighted average remaining contractual term (in years) |  | Aggregate intrinsic value |
Balance, December 31, 2021 | 79,644,550 |  |  | $ | 1.44 |  |  |  |  |  |
Granted | 6,748,081 |  |  | 2.69 |  |  |  |  |  |
Exercised | (19,002,590) |  |  | 0.63 |  |  |  |  |  |
Forfeited | (4,144,285) |  |  | 2.49 |  |  |  |  |  |
Balance, September 30, 2022 | 63,245,756 |  |  | $ | 1.75 |  |  | 7.1 |  | $ | 51,428 |  |
Exercisable, September 30, 2022 | 42,496,184 |  |  | $ | 1.32 |  |  | 6.4 |  | $ | 46,398 |  |
Schedule of Restricted Stock Unit Activity | RSU activity under the Plan and the 2017 Plan was as follows:
| Unvested RSUs outstanding |
Number of shares |  | Weighted- average grant date fair value |
Balance, December 31, 2021 | 34,054,713 |  |  | $ | 4.72 |  |
Granted | 106,875,524 |  |  | 3.74 |  |
Vested | (20,544,459) |  |  | 4.31 |  |
Forfeited | (12,611,734) |  |  | 4.35 |  |
Balance, September 30, 2022 | 107,774,044 |  |  | $ | 3.86 |  |
Schedule of Stock-Based Compensation Expense | Total stock-based compensation expense by function was as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
| 2022 |  | 2021 |  | 2022 |  | 2021 |
Research and development |  | $ | 31,592 |  |  | $ | 38,015 |  |  | $ | 99,243 |  |  | $ | 112,329 |  |
Selling, general, and administrative |  | 5,213 |  |  | 1,952 |  |  | 13,087 |  |  | 6,076 |  |
Total |  | $ | 36,805 |  |  | $ | 39,967 |  |  | $ | 112,330 |  |  | $ | 118,405 |  |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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