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Stock-Based Compensation (Tables)

9 Months Ended

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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- References

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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

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