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Stockholders' Equity (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Stockholders' Equity |
Schedule of common stock reserved for future issuance | ​
​ | ​
Stock options outstanding under 2019 Equity Incentive Plan | 882,892
Restricted stock units outstanding under 2019 Equity Incentive Plan | 271,951
Performance stock units outstanding under 2019 Equity Incentive Plan | 383,103
Shares authorized for future issuance under 2019 Equity Incentive Plan | 2,594,587
Shares authorized for future issuance under 2019 Employee Stock Purchase Plan | 907,850
Total | 5,040,383
​
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year ended December 31,
​ | 2022 |  | 2021 |  | 2020
​ | (in thousands)
Stock-Based Compensation Expense | $ | 11,624 | ​ | $ | 5,584 | ​ | $ | 2,167
Schedule of stock option transactions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted average | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | remaining | ​ | Aggregate
​ | ​ | Number of | ​ | Weighted-average | ​ | contractual term | ​ | intrinsic value
​ |  | shares |  | exercise price |  | (in years) |  | (in thousands)
Outstanding at January 1, 2022 | ​ | 933,051 | ​ | $ | 29.41 | ​ | 7.59 | ​ | $ | 36,679
Options granted | ​ | 122,539 | ​ | ​ | 51.99 | ​ | ​ | ​ | ​ | ​
Options exercised | ​ | (148,427) | ​ | ​ | 15.31 | ​ | ​ | ​ | ​ | ​
Options canceled | ​ | (24,271) | ​ | ​ | 68.13 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2022 | ​ | 882,892 | ​ | $ | 33.85 | ​ | 6.92 | ​ | $ | 16,990
Vested and Exercisable at December 31, 2022 | ​ | 658,858 | ​ | $ | 26.33 | ​ | 6.48 | ​ | $ | 16,001
Schedule of fair value of each option granted was estimated on the grant date using the Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year ended December 31,
​ | 2022 |  | 2021 |  | 2020
​ | (in thousands)
Risk free rate of return (1) | ​ | 1.69% - 4.23% | ​ | ​ | 0.57% - 1.35% | ​ | ​ | 0.32% - 1.52%
Expected share price volatility (2) | ​ | 39.73% - 43.03% | ​ | ​ | 26.06% - 39.41% | ​ | ​ | 18.13% - 25.67%
Expected life in years (3) | ​ | 5.89 | ​ | ​ | 5.89 | ​ | ​ | 5.63 - 6.08
Dividend yield (4) | ​ | 0% | ​ | ​ | 0% | ​ | ​ | 0%
(1) | Determined based on the U.S. Treasury yield in effect at the time of the grant for zero-coupon U.S. Treasury notes with remaining terms similar to the expected term of the options.
(2) | Determined based on a blend of the Company’s historic stock price volatility and the historic volatility of a peer group of publicly traded companies.
(3) | Determined using the “simplified method” for estimating the expected option life, which is the average of the weighted-average vesting period and contractual term of the option as the Company does not have sufficient historical exercise data to provide a reasonable basis upon which to estimate expected term due to the limited period of time its common stock has been publicly traded.
(4) | Determined to be zero as the Company does not currently plan to issue dividends.
​
Schedule of RSU transactions | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-average
​ | ​ | Number of | ​ | grant date
​ |  | shares |  | fair value
Non vested outstanding at January 1, 2022 | ​ | 235,696 | ​ | $ | 79.33
Granted | ​ | 100,106 | ​ | ​ | 51.53
Vested | ​ | (57,536) | ​ | ​ | 80.60
Forfeited | ​ | (6,315) | ​ | ​ | 76.30
Non vested outstanding at December 31, 2022 | ​ | 271,951 | ​ | $ | 68.90
Schedule of Performance stock unit transactions | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-average
​ | ​ | Number of | ​ | grant date
​ |  | shares |  | fair value
Non vested outstanding at January 1, 2022 | ​ | 358,401 | ​ | $ | 36.87
Granted | ​ | 26,165 | ​ | ​ | 50.36
Vested | ​ | — | ​ | ​ | —
Forfeited | ​ | (1,463) | ​ | ​ | 80.69
Non vested outstanding at December 31, 2022 | ​ | 383,103 | ​ | $ | 37.62

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