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Stock Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2022
Stock Based Compensation |
Weighted Average Assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, |
​ |  | 2022 |  | 2021 |
Dividend yield |  | 0 | % | 0 | %
Expected volatility |  | 70 | % | 98 | %
Risk-free interest rate |  | 1.89 | % | 0.71 | %
Expected term |  | 5.66 years | ​ | 5.61 years | ​
Stock Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted |  | Weighted | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ | ​ | Number of | ​ | Price | ​ | Term | ​ | Value
​ | ​ | shares | ​ | Per Share | ​ | (in years) | ​ | (in thousands)
Outstanding at January 1, 2022 | ​ | ​ | 1,911,177 | ​ | $ | 20.64 |  | ​ | 6.33 | ​ | $ | 15,103
Granted |  | ​ | 160,000 | ​ |  | 20.60 |  | ​ |  |  | ​ |
Exercised |  | ​ | (90,811) | ​ |  | 6.97 |  | ​ |  |  | ​ |
Forfeited, expired or cancelled | ​ | ​ | (6,215) | ​ |  | 27.83 |  | ​ |  |  | ​ |
Outstanding at March 31, 2022 | ​ | ​ | 1,974,151 | ​ | $ | 21.25 |  | ​ | 6.44 | ​ | $ | 24,090
Exercisable at March 31, 2022 | ​ | ​ | 1,522,824 | ​ | $ | 19.70 |  | ​ | 5.60 | ​ | $ | 22,139
Stock-based Compensation Expense | The following table shows total stock-based compensation expense for stock options and ESPP in the condensed consolidated statements of operations and comprehensive loss (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2022 |  | 2021
Research and development | ​ | $ | — | ​ | $ | —
General and administrative | ​ |  | 978 | ​ |  | 2,898
Total stock-based compensation expense | ​ | $ | 978 | ​ | $ | 2,898

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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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