Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2022

Stockholders' Equity

Schedule of common stock reserved for future issuance

Stock options outstanding under 2019 Equity Incentive Plan	919,401
Restricted stock units outstanding under 2019 Equity Incentive Plan	312,832
Performance stock units outstanding under 2019 Equity Incentive Plan, at target	382,765
Shares authorized for future issuance under 2019 Equity Incentive Plan	2,591,699
Shares authorized for future issuance under 2019 Employee Stock Purchase Plan	915,762
Total	5,122,459

Schedule of stock-based compensation expense

	Three months ended June 30,				Six months ended June 30,
	2022		2021		2022		2021
	(in thousands)				(in thousands)
Stock-Based Compensation	$	2,704	$	907	$	5,463	$	1,845

Schedule of stock option transactions

	Number of shares		Weighted-average exercise price	Weighted average remaining contractual term (in years)		Aggregate intrinsic value (in thousands)
Outstanding at January 1, 2022	933,051	$	29.41	7.59	$	36,679
Options granted	117,249		50.81
Options exercised	(118,374)		15.00
Options canceled	(12,525)		70.20
Outstanding at June 30, 2022	919,401	$	33.44	7.42	$	31,993
Vested and Exercisable at June 30, 2022	611,607	$	24.58	6.97	$	25,852

Schedule of fair value of each option granted was estimated on the grant date using the Black-Scholes option pricing model

Risk free rate of return (1)	1.69% - 3.03%
Expected share price volatility (2)	39.79% - 41.81%
Expected life in years (3)	5.89 years
Dividend yield (4)	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 has not historically issued dividends.

Schedule of RSU transactions

	Number of shares		Weighted-average grant date fair value
Outstanding at January 1, 2022	235,696	$	79.33
Granted	95,892		50.96
Released	(13,763)		88.29
Forfeited	(4,993)		79.92
Non vested outstanding at June 30, 2022	312,832	$	70.23

Schedule of Performance stock unit transactions

	Number of shares		Weighted-average grant date fair value
Outstanding at January 1, 2022	358,401	$	36.87
Granted	25,827		49.92
Vested	—		—
Forfeited	(1,463)		80.69
Non vested outstanding at June 30, 2022	382,765	$	37.58