Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

A summary of stock option activity under the 2019 Plan for the three months ended March 31, 2021 is as follows:

	Options Outstanding			Weighted- Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2020		18,762,920		$	4.97	$	—
Options Granted		1,771,685			10.58
Options Cancelled		(474,188	)		4.81
Options Exercised		(368,375	)		4.20
Outstanding at March 31, 2021		19,692,042		$	5.49	$	62,105

Summary of Estimated Fair Value of Stock Option Grant Determined on Grant Date Using black-Scholes Valuation Model

The estimated fair value of each stock option grant was determined on the grant date using the Black-Scholes valuation model with the following weighted-average assumptions:

	Three Months Ended March 31,
	2021			2020
Weighted-average grant date fair value	$	8.63		$	1.36
Dividend yield		—	%		—	%
Volatility		111	%		94	%
Risk-free interest rate		1.00	%		0.71	%
Expected life of options (years)	6.0			5.9

Summary of RSU Activity

A summary of RSU activity under the 2019 Plan for the three months ended March 31, 2021 is as follows:

	Number of Shares			Weighted- Average Grant Date Fair Value Per Share
Outstanding at December 31, 2020		—		$	—
RSUs Granted		2,148,070			10.41
RSUs Released		(132,540	)		13.96
RSUs Cancelled		(5,941	)		10.18
Outstanding at March 31, 2021		2,009,589		$	10.18