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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Schedule of stock-based compensation expense recognized for employees and non-employees

​

​	​	​	​	​	​	​	​
​	​	Three Months Ended					​
​	​	March 31,					​
By Expense Category:		2023			2022		​
Research and development	​	$	581	​	$	383	​
General and administrative	​		1,971	​		3,802	​
Total stock-based compensation expense	​	$	2,552	​	$	4,185	​

​

Schedule of unamortized compensation expense and weighted average remaining recognition period

​

​	​	​	​	​	​
​	​	As of March 31, 2023
​	​	​	​	​	Weighted
​	​	​	​	​	Average
​	​	​	​	​	Remaining
​	​	​	​	​	Recognition
​		Unamortized			Period
​	​	Expense		​	(Years)
Stock options	​	$	19,293		2.9
Restricted stock units	​	$	10,692	​	3.6

​

Schedule of assumptions used for estimating the fair value of stock options

​

​	​	​	​	​
​	​	Three Months Ended
​	​	March 31,
​		2023		2022
Expected dividend yield	​	—	​	—
Risk-free interest rate		3.46% - 3.64%		1.46% - 2.34%
Expected volatility		94% - 95%		90% - 92%
Expected life (years)		5.9 - 6.1		6.0 - .6.1

​

Schedule of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		Weighted		​	​
​	​	​	​	Weighted		​	Average	​	​	​
​	​	​	​	Average		​	Contractual	​	Aggregate
​	​	Number of	​	Exercise		​	Term	​	Intrinsic
​	​	Shares	​	Price		​	(in years)	​	Value
Outstanding as of December 31, 2022		8,398,262	​	$	4.49				​
Granted		1,144,146	​	​	6.17				​
Exercised		(21,447)	​	​	3.68				​
Cancelled		(6,120)	​	​	2.97				​
Outstanding as of March 31, 2023		9,514,841	​	$	4.69		8.5	​	$	22,693
Exercisable as of March 31, 2023		4,366,134	​	$	4.27		7.8	​	$	13,072
Vested and expected to vest as of March 31, 2023		9,112,607	​	$	4.69		8.5	​	$	21,845

​

Schedule of non vested RSU awards outstanding

​

​	​	​	​	​	​
​				Weighted
​	​	​	​	Average
​	​	​	​	Grant-Date
​	​	Number of	​	Fair Value
​	​	RSUs	​	(per RSU)
Unvested as of December 31, 2022		407,726	​	$	5.57
Granted		1,483,166	​		6.48
Vested		(89,804)	​		6.00
Forfeited		(1,617)	​		6.75
Unvested as of March 31, 2023		1,799,471	​	$	6.30

Employee Stock Purchase Plan

Schedule of assumptions used for estimating the fair value of stock options

​

​	​	​	​	​
​	​	Three Months Ended
​	​	March 31,
​		2023		2022
Expected dividend yield	​	—	​	—
Risk-free interest rate	​	5.20%	​	0.69%
Expected volatility	​	64%	​	80%
Expected life (years)	​	0.50	​	0.50

​

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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-SubTopic 10
-Section 50
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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement.

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