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Stock-based awards (Tables)

9 Months Ended

Sep. 30, 2021

Stock-based awards

Schedule of assumptions used to determine grant-date fair value of stock options granted

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Three Months Ended September 30,

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Nine Months Ended September 30,

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2021

​

2020

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2021

​

2020

Expected term (in years)

5.96

​

n/a

​

​

5.89

​

​

5.81

​

Expected volatility

70.04

%

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n/a

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70.34

%

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77.70

%

Weighted average risk-free interest rate

0.91

%

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n/a

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​

0.82

%

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1.07

%

Expected dividend yield

0.00

%

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n/a

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0.00

%

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0.00

%

Summary of stock option activity

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​	​	​	​	​	​	​	​	​	​	​
​		​		Weighted-			Weighted-		​	​
​	​	​	​	Average		​	Average	​	Aggregate
​	​	​	​	Exercise		​	remaining	​	Intrinsic
​	​	Number	​	Price per		​	contractual	​	Value
​	​	of Options	​	Share		​	term (years)	​	(000's)
Balance outstanding, December 31, 2020	​	3,733,312	​	$	12.15	​	8.53	​	$	52,498
Options granted	​	422,263	​	$	25.71	​	​	​	​	​
Options exercised	​	(123,523)	​	$	5.15	​	​	​	​	​
Balance outstanding, September 30, 2021	​	4,032,052	​	$	13.79	​	7.98	​	$	39,854
Exercisable, September 30, 2021		1,843,127	​	$	10.20	​	7.63	​	$	23,444
Vested and expected to vest, September 30, 2021		4,032,052	​	$	13.79	​	7.98	​	$	39,854

Summary of stock-based compensation expense

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Three Months Ended September 30,

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Nine Months Ended September 30,

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2021

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2020

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2021

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2020

Classified within research and development expense

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$

770

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$

378

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$

2,223

​

$

1,115

Classified within general and administrative expense

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1,842

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1,168

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5,189

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2,991

Total stock-based compensation expense

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$

2,612

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$

1,546

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$

7,412

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$

4,106

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- Definition

Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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- Definition

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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-Topic 718
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- Definition

Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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