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Stock Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Sharebased Payment Arrangement [Line Items] |
Schedule of Stock Based Compensation Expense |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Research and development |  | $ | 45 |  |  | $ | 176 |  |  | $ | 122 |  |  | $ | 231 |
General and administrative |  |  | 366 |  |  |  | 51 |  |  |  | 409 |  |  |  | (1 | )
|  | $ | 411 |  |  | $ | 227 |  |  | $ | 531 |  |  | $ | 230 |
Summary of Stock Options | Stock option activity under the Plans is set forth below:
|  |  |  |  |  |  |  | Weighted- |
|  | Shares |  |  |  |  |  | Average |
|  | Available |  |  | Total Options |  |  | Exercise |
|  | for Grant |  |  | Outstanding |  |  | Price |
Balance—January 1, 2021 |  |  | 489,797 |  |  |  | 452,165 |  |  | $ | 5.35 |
Assumed in reverse recapitalization |  |  | — |  |  |  | 178,732 |  |  |  | 178.64 |
Granted |  |  | (186,482 | ) |  |  | 186,482 |  |  |  | 20.99 |
Exercised |  |  | — |  |  |  | (10,654 | ) |  |  | 4.60 |
Cancelled and forfeited |  |  | 5,667 |  |  |  | (6,316 | ) |  |  | 18.36 |
Balance—June 30, 2021 |  |  | 308,982 |  |  |  | 800,409 |  |  |  | 47.70 |
Summary of Information About Stock Options Outstanding | The following table summarizes information about stock options outstanding at June 30, 2021:
|  |  |  |  | Weighted |  |  |  |  |  |  |
|  |  |  |  | Average |  |  | Weighted |  |  |  |
|  |  |  |  | Remaining |  |  | Average |  |  | Aggregate |
|  |  |  |  | Contractual |  |  | Exercise |  |  | Intrinsic |
|  | Shares |  |  | Life (In Years) |  |  | Price |  |  | Value |
Options outstanding |  |  | 800,409 |  |  |  | 8.46 |  |  | $ | 47.70 |  |  | $ | 2,594,131 |
Vested and expected to vest |  |  | 799,823 |  |  |  | 8.46 |  |  | $ | 47.63 |  |  | $ | 2,593,281 |
Exercisable |  |  | 366,374 |  |  |  | 7.64 |  |  | $ | 89.59 |  |  | $ | 1,133,181 |
Employee |
Sharebased Payment Arrangement [Line Items] |
Summary of Grant Date Fair Value Assumptions | The fair value of employee stock options was estimated using the following assumptions for the six months ended June 30, 2021:
Expected term (in years) |  |  | 6.0 – 6.1 |
Expected volatility |  |  | 67% |
Risk-free interest rate |  |  | 1.0% – 1.1% |
Dividends |  |  | 0% |
Non-Employee |
Sharebased Payment Arrangement [Line Items] |
Summary of Grant Date Fair Value Assumptions | The fair value of non-employee stock options was estimated using the following assumptions for the six months ended June 30, 2021:
Expected term (in years) |  |  | 10 |
Expected volatility |  |  | 66 | %
Risk-free interest rate |  |  | 1.50 | %
Dividends |  |  | 0 | %

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(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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