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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Assumptions Used to Determine Fair Value of Share-Based Awards | The weighted average assumptions used in the Black-Scholes option pricing model to determine the fair value of stock option awards granted to employees during 2021 and 2020 were as follows:
| 2021 | 2020
Expected stock price volatility | 97.06% | 97.86%
Risk free interest rate | 1.07% | 0.51%
Expected term (in years) | 5.78 | 5.44
Expected dividend yield | — | —
Schedule of Share-Based Award Activity | The following table summarizes the stock option activity for the periods presented:
| Number of Shares |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term (years)
Outstanding at January 1, 2020 | 10,414 |  |  | $ | 20.67 |  |  | 8.2
Granted | 14,416 |  |  | $ | 15.79 |  |  |
Outstanding at December 31, 2020 | 24,830 |  |  | $ | 17.84 |  |  | 8.4
Granted | 481,861 |  |  | $ | 5.05 |  |  |
Outstanding at December 31, 2021 | 506,691 |  |  | $ | 5.68 |  |  | 9.3
Vested and exercisable at December 31, 2021 | 130,059 |  |  | $ | 7.30 |  |  | 9.0
Vested and expected to vest at December 31, 2021 | 506,691 |  |  | $ | 5.68 |  |  | 9.3
Schedule of RSU Share-Based Payment Award Activity | The following table summarizes activity related to RSU share-based payment awards:
| Number of RSUs |  | Weighted Average Grant Date Fair value
Unvested balance at January 1, 2020 | — |  |  |
Granted | 177 |  |  | $ 13.55
Vested | (132) |  |  | $ 13.55
Unvested balance at December 31, 2020 | 45 |  |  | $ 13.55
Granted | 50,096 |  |  | $ | 1.74 |
Vested | (20,915) |  |  | $ | 1.77 |
Cancelled | (29,226) |  |  | $ | 1.74 |
Unvested balance at December 31, 2021 | — |  |  |

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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 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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