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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Schedule of Assumptions to Determine Fair Value of Stock Options Awards | The following table summarized the stock option activity and related information under all stock option plans:
|  | Number of Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding as of January 1, 2019 |  |  | 5,738,520 |  |  | $ | 0.17 |  |  |  | 9.01 |  |  | $ | 2,620 |
Granted |  |  | 7,089,185 |  |  |  | 0.29 |  |  |  | — |  |  |  | — |
Exercised |  |  | (243,780 | ) |  |  | 0.14 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (539,751 | ) |  |  | 0.23 |  |  |  | — |  |  |  | — |
Expired |  |  | (130,394 | ) |  |  | 0.24 |  |  |  | — |  |  |  | — |
Outstanding as of December 31, 2019 |  |  | 11,913,780 |  |  | $ | 0.24 |  |  |  | 8.73 |  |  | $ | 15,707 |
Granted |  |  | 7,393,347 |  |  |  | 0.55 |  |  |  | — |  |  |  | — |
Exercised |  |  | (351,037 | ) |  |  | 0.20 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (1,006,417 | ) |  |  | 0.40 |  |  |  | — |  |  |  | — |
Expired |  |  | (147,687 | ) |  |  | 0.27 |  |  |  | — |  |  |  | — |
Outstanding as of December 31, 2020 |  |  | 17,801,986 |  |  | $ | 0.36 |  |  |  | 8.27 |  |  | $ | 140,560 |
Exercised |  |  | (3,701,243 | ) |  |  | 0.25 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (242,387 | ) |  |  | 0.41 |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding as of December 31, 2021 |  |  | 13,858,356 |  |  | $ | 0.39 |  |  |  | 7.47 |  |  | $ | 99,406 |
Vested and exercisable as of December 31, 2021 |  |  | 9,678,341 |  |  | $ | 0.33 |  |  |  | 7.24 |  |  | $ | 69,986 |
Vested and expected to vest as of December 31, 2021 |  |  | 13,858,356 |  |  | $ | 0.39 |  |  |  | 7.47 |  |  | $ | 99,406 |
Summary of Stock-Based Compensation Expense | Total stock-based compensation expense by function was as follows (in thousands):
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Cost of Revenue |  | $ | 1,483 |  |  | $ | 470 |  |  | $ | 32 |
Research and development expenses |  |  | 12,754 |  |  |  | 1,895 |  |  |  | 1,235 |
Sales and marketing expenses |  |  | 371 |  |  |  | 26 |  |  |  | 17 |
General and administrative expenses |  |  | 7,629 |  |  |  | 1,415 |  |  |  | 869 |
Total |  | $ | 22,237 |  |  | $ | 3,806 |  |  | $ | 2,153 |
Restricted Stock [Member] |
Schedule of Restricted Stock Activity | Restricted stock activity for the year ended December 31, 2020 and December 31, 2019 is as follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Outstanding as of January 1, 2019 |  |  | 34,878,713 |  |  | $ | 0.03 |
Granted |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Vested |  |  | (17,439,359 | ) |  |  | 0.03 |
Outstanding as of December 31, 2019 |  |  | 17,439,354 |  |  | $ | 0.03 |
Granted |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Vested |  |  | (17,439,354 | ) |  |  | 0.03 |
Outstanding as of December 31, 2020 |  |  | — |  |  | $ | — |
There were no restricted stock granted during the years ended December 31, 2021, 2020 and 2019.
Restricted Stock Units (RSUs) [Member] |
Schedule of Stock Options Activity | The following table summarizes our RSU activity (includes performance-based restricted stock units) for the year ended December 31, 2021:
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Outstanding as of January 1, 2020 |  |  | — |  |  | $ | — |
Granted |  |  | 1,536,195 |  |  |  | 7.74 |
Released |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Outstanding as of December 31, 2020 |  |  | 1,536,195 |  |  | $ | 7.74 |
Granted |  |  | 6,206,975 |  |  |  | 10.51 |
Released |  |  | (758,945 | ) |  |  | 9.34 |
Forfeited |  |  | (353,146 | ) |  |  | 9.83 |
Outstanding as of December 31, 2021 |  |  | 6,631,079 |  |  | $ | 10.04 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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