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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2023
Stock-based Compensation |
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | Aggregate
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | Intrinsic
​ | ​ | ​ | ​ | exercise | ​ | contractual | ​ | Value (in
​ | ​ | Options | ​ | price | ​ | term (years) | ​ | thousands)
Outstanding as of December 31, 2022 |  | 3,356,937 | ​ | $ | 1.01 |  |  |  | ​ |
Sesen Bio options assumed in the Merger |  | 765,223 | ​ |  | 27.94 |  |  |  | ​ |
Exercised | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Granted |  | 144,352 | ​ |  | 5.64 |  |  |  | ​ |
Forfeited |  | (82,427) | ​ |  | 1.46 |  |  |  | ​ |
Expired |  | (38) | ​ |  | 1.46 |  |  |  | ​ |
Outstanding as of March 31, 2023 |  | 4,184,047 | ​ | $ | 6.11 |  | 5.9 | ​ | $ | 6,798
Exercisable as of March 31, 2023 |  | 3,015,084 | ​ | $ | 5.58 |  | 3.6 | ​ | $ | 5,057
Vested and expected to vest at March 31, 2023 |  | 4,184,047 | ​ | $ | 6.11 |  | 5.9 | ​ | $ | 6,798
​
Summary of estimated using the Black-Scholes option-pricing model | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, |
​ |  | 2023 |  | 2022 |
Risk-free interest rate |  | 2.92% - 4.03% |  | 2.40% - 2.41 | %
Expected term |  | 6 years |  | 6 years | ​
Expected volatility |  | 57.77% - 62.65 | % | 54.54% - 54.58 | %
Expected dividend yield |  | — |  | — | ​
​
Summary of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31,
​ |  | 2023 |  | 2022
Research and development | ​ | $ | 10 | ​ | $ | 41
General and administrative | ​ |  | 255 | ​ |  | 48
​ | ​ | $ | 265 | ​ | $ | 89
​

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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