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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Weighted Average Assumptions | The weighted average assumptions used in the Black-Scholes model for option grants to employees and directors are presented below:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Risk-free interest rate | 0.90% |  | 0.35% |  | 0.90% |  | 0.64%
Expected volatility | 94% |  | 85% |  | 93% |  | 77%
Expected life in years | 5.7 |  | 5.9 |  | 5.8 |  | 5.9
Dividend yield | — |  | — |  | — |  | —

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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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