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Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Schedule of Assumptions Used to Determine Fair Value of Stock Options Granted | The fair value of the stock options granted during the six months ended June 30, 2021 and 2020 was determined using the Black-Scholes option pricing model with the following assumptions:
| June 30, 2021 |  |  | June 30, 2020
Expected volatility | 75.9-78.0% |  |  | 70.3-74.7%
Expected term (years) | 5.5-7.0 |  |  | 5.5-7.0
Risk free interest rate | 0.5%-1.2% |  |  | 0.3%-1.6%
Expected dividend yield |  | 0 | % |  | 0%
Exercise price | $66.82-$82.21 |  |  | $31.95-$50.00
Summary of Stock Option Activity | The following table provides a summary of the stock option activity under the 2018 Plan during the six months ended June 30, 2021. These amounts include stock options granted to employees, directors and consultants.
Stock options |  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2020 |  |  | 4,321,882 |  |  | $ | 26.35 |  |  |  |  |  |  |  |  |
Granted |  |  | 1,491,974 |  |  | $ | 77.53 |  |  |  |  |  |  |  |  |
Exercised |  |  | (361,706 | ) |  | $ | 21.41 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (19,225 | ) |  | $ | 50.50 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2021 |  |  | 5,432,925 |  |  | $ | 40.65 |  |  |  | 8.40 |  |  | $ | 199,393,804 |
Exercisable at June 30, 2021 |  |  | 2,172,181 |  |  | $ | 22.78 |  |  |  | 7.69 |  |  | $ | 117,772,016 |
Summary of Restricted Stock Grant Activity | The following table provides a summary of the restricted stock grant activity under the Incentive Plan during the six months ended June 30, 2021. These amounts include restricted stock granted to employees, directors and consultants.
Restricted shares |  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested restricted stock at December 31, 2020 |  |  | 238,712 |  |  | $ | 16.00 |
Vested |  |  | (125,028 | ) |  | $ | 16.00 |
Unvested restricted stock at June 30, 2021 |  |  | 113,684 |  |  | $ | 16.00 |
Restricted Stock Units |
Summary of Restricted Stock Grant Activity | The following table provides a summary of the restricted stock unit activity under the 2018 Plan during the six months ended June 30, 2021. These amounts include restricted stock units granted to employees.
Restricted stock units |  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested restricted stock units at December 31, 2020 |  |  | 133,049 |  |  | $ | 20.01 |
Vested |  |  | (40,344 | ) |  | $ | 19.36 |
Cancelled |  |  | (387 | ) |  | $ | 19.36 |
Unvested restricted stock units at June 30, 2021 |  |  | 92,318 |  |  | $ | 20.30 |

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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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