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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2022
Stock Based Compensation |
Weighted Average Assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, |  | ​ | Six Months Ended June 30, |
​ |  | 2022 |  | 2021 |  |  | 2022 |  | 2021 |
Dividend yield |  | 0 | % | 0 | % |  | 0 | % | 0 | %
Expected volatility |  | 69 | % | 76 | % |  | 70 | % | 94 | %
Risk-free interest rate |  | 2.90 | % | 1.06 | % |  | 2.17 | % | 0.77 | %
Expected term |  | 5.61 years | ​ | 6.00 years | ​ |  | 5.65 years | ​ | 5.68 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 |  | ​ | 222,972 | ​ |  | 19.83 |  | ​ |  |  | ​ |
Exercised |  | ​ | (101,811) | ​ |  | 8.07 |  | ​ |  |  | ​ |
Forfeited, expired or cancelled | ​ | ​ | (7,447) | ​ |  | 31.04 |  | ​ |  |  | ​ |
Outstanding at June 30, 2022 | ​ | ​ | 2,024,891 | ​ | $ | 21.15 |  | ​ | 6.31 | ​ | $ | 16,048
Exercisable at June 30, 2022 | ​ | ​ | 1,571,458 | ​ | $ | 19.94 |  | ​ | 5.47 | ​ | $ | 15,414
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 June 30, | ​ | Six Months Ended June 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
General and administrative | ​ |  | 837 | ​ |  | 768 | ​ |  | 1,815 | ​ |  | 3,666
Total stock-based compensation expense | ​ | $ | 837 | ​ | $ | 768 | ​ | $ | 1,815 | ​ | $ | 3,666

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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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