Stock-based compensation (Tables)

9 Months Ended

Sep. 30, 2020

Summary of Stock Options

Stock option activity during the nine months ended September 30, 2020 is as follows:

	Time-Vesting Options					Performance-Vesting Options
	Shares subject to options			Weighted- average exercise price		Shares subject to options			Weighted- average exercise price		Weighted- average remaining contractual term (years)		Aggregate Intrinsic Value
Outstanding as of January 1, 2020		346,872		$	1.30		—		$	—		9.01	$	744
Granted		1,552,942			3.45		454,994			3.45
Exercised		(156,783	)		2.25		(20,017	)		3.45				1,786
Forfeited		(31,966	)		1.30		—
Outstanding as of September 30, 2020		1,711,065		$	3.16		434,977		$	3.45		9.30	$	19,888
Options vested and expected to vest as of September 30, 2020		2,137,351		$	2.84		434,977		$	3.45		9.15	$	24,554
Options vested and exercisable as of September 30, 2020		1,337,277		$	3.36		71,670		$	3.45		9.38	$	12,859

Summary of Stock Based Compensation Expense Was Allocated

Stock-based compensation expense was allocated as follows for the three and nine months ended September 30, 2020 and 2019:

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Research and development	$	331	$	97	$	652	$	368
General and administrative		685		54		1,022		236
	$	1,016	$	151	$	1,674	$	604

Restricted Stock [Member]

Summary of Stock Options

The following table summarizes the Company’s restricted common stock activity for the nine months ended September 30, 2020:

	Number of Awards			Weighted- Average Grant Date Fair Value		Aggregate Fair Value
Issued and unvested as of January 1, 2020		827,192		$	1.01	$	834
Restricted stock awards vested		(314,093	)		0.86		271
Issued and unvested as of September 30, 2020		513,099		$	1.10	$	563