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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Stock Based Compensation |
Schedule of recognized & allocated compensation costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2024 |  | 2023 | ​ | 2024 |  | 2023
Stock-based compensation costs related to RSUs | ​ | $ | 1,397 | ​ | $ | 954 | ​ | $ | 2,609 | ​ | $ | 1,589
Stock-based compensation costs related to stock options | ​ |  | 1,612 | ​ |  | 1,889 | ​ |  | 3,226 | ​ |  | 3,476
Stock-based compensation costs related to the ESPP | ​ | ​ | 42 | ​ | ​ | 80 | ​ | ​ | 79 | ​ | ​ | 80
Total stock-based compensation costs | ​ | $ | 3,051 | ​ | $ | 2,923 | ​ | $ | 5,914 | ​ | $ | 5,145
Schedule of award activity for stock options and RSU's | The unrecognized future compensation costs as of June 30, 2024 and 2023, were $25,868 and $34,327, respectively. The following table summarizes our award activity for RSUs and stock options for the three and six months ended June 30, 2024:
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | ​
​ | ​ | RSUs | ​ | Stock Options
Balance at December 31, 2023 | ​ | 4,473,016 |  | ​ | 24,264,016
Granted | ​ | 3,159,872 | ​ | ​ | 4,566,167
Vested or Exercised | ​ | (264,754) | ​ | ​ | (2,360,316)
Forfeited | ​ | (72,619) | ​ | ​ | (842,395)
Balance at March 31, 2024 | ​ | 7,295,515 | ​ | ​ | 25,627,472
Granted | ​ | 2,162,222 | ​ | ​ | 1,757,960
Vested or Exercised | ​ | (867,515) | ​ | ​ | (1,230,581)
Forfeited | ​ | (886,343) | ​ | ​ | (1,873,843)
Balance at June 30, 2024 | ​ | 7,703,879 | ​ | ​ | 24,281,008
​ ​ ​
Schedule of fair value of each option using the Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Six Months Ended June 30, |  | ​
​ |  | 2024 |  | 2023 |  | ​
Approximate risk‑free rate |  | ​ | 4.23 | % | ​ | 4.17 | % | ​
Volatility |  | ​ | 48.10 | % | ​ | 46.91 | % | ​
Average expected life (in years) |  | ​ | 6 | ​ | ​ | 6 | ​ | ​
Dividend yield |  | ​ | — | % | ​ | — | % | ​
Weighted‑average grant date fair value | ​ | $ | 1.59 | ​ | $ | 2.8 | ​ | ​
Estimated fair value of total stock options granted | ​ | $ | 5,175 | ​ | $ | 7,815 | ​ | ​
​

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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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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