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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Estimated Weighted Average Grant Date Fair Value per Share | The Company granted options to purchase an aggregate of 433,700 and 500,350 shares of common stock in the years ended December 31, 2021 and 2020, respectively. The fair values of employee stock options granted in the years ended December 31, 2021 and 2020 were estimated at the date of grant using the Black-Scholes model with the following assumptions and had the following estimated weighted average grant date fair value per share:
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Expected term |  | 5.9 years |  |  | 6.0 years |
Expected volatility |  |  | 94 | % |  |  | 96 | %
Risk-free interest rate |  |  | 1.08 | % |  |  | 0.50 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Weighted-average grant date fair value per share |  | $ | 2.09 |  |  | $ | 3.28 |
Summary of Stock Option Activities | A summary of ARCA’s stock option activities for the years ended December 31, 2021 and 2020, and related information as of December 31, 2021, is as follows:
|  | Options Outstanding |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Options outstanding - December 31, 2019 |  |  | 31,136 |  |  | $ | 84.50 |  |  |  |  |  |  |  |  |
Granted |  |  | 500,350 |  |  |  | 4.29 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited and cancelled |  |  | (248 | ) |  |  | 610.46 |  |  |  |  |  |  |  |  |
Options outstanding - December 31, 2020 |  |  | 531,238 |  |  | $ | 8.71 |  |  |  | 9.68 |  |  | $ | — |
Granted |  |  | 433,700 |  |  |  | 2.77 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited and cancelled |  |  | (60,815 | ) |  |  | 12.71 |  |  |  |  |  |  |  |  |
Options outstanding - December 31, 2021 |  |  | 904,123 |  |  | $ | 5.59 |  |  |  | 9.18 |  |  | $ | — |
Options exercisable - December 31, 2021 |  |  | 159,164 |  |  | $ | 15.91 |  |  |  | 8.21 |  |  | $ | — |
Options vested and expected to vest - December 31, 2021 |  |  | 902,666 |  |  | $ | 5.60 |  |  |  | 9.18 |  |  | $ | — |
Summary of Non-cash, Share-based Compensation Expense | For the years ended December 31, 2021 and 2020, the Company recognized the following non-cash, share-based compensation expense (in thousands):
| Years Ended |
| December 31, |
| 2021 |  |  | 2020 |
Research and development | $ | 160 |  |  | $ | 26 |
General and administrative |  | 337 |  |  |  | 17 |
Total | $ | 497 |  |  | $ | 43 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + 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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