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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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