Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense for Options Granted Reflected in the Consolidate Statement of Operations and Comprehensive Loss

Stock-based compensation expense for stock options and RSUs is reflected in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
General and administrative	$	840	$	101	$	2,957	$	248
Research and development	507		25		1,318		249
Total	$	1,347	$	126	$	4,275	$	497

Schedule of Stock Option Activity

The following table summarizes the stock option activity:

	Number of Shares	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Options outstanding at December 31, 2020	4,224,433	$	0.84	8.9	$	5,496
Granted	7,469,300	$	3.33		$	—
Exercised	(901,250)	$	0.73		$	8,042
Forfeited	(274,220)	$	2.96		$	1,146
Options outstanding at September 30, 2021	10,518,263	$	2.56	9.0	$	49,552
Options exercisable at September 30, 2021	991,429	$	1.71	7.8	$	5,629

Share-based Payment Arrangement, Restricted Stock Unit, Activity

The following table summarizes the RSU activity:

	Number of Shares	Weighted- Average Grant-Date Fair Value		Aggregate Intrinsic Value (in thousands)
RSUs outstanding at December 31, 2020	—	$	—	$	—
Granted	179,951	$	6.69	$	1,280
Forfeited	(900)	$	8.75	$	6
RSUs outstanding at September 30, 2021	179,051	$	6.68	$	1,286