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Stock-based awards (Tables)

3 Months Ended

Mar. 31, 2021

Stock-based awards

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

	Three Months Ended March 31,
	2021			2020
Expected term (in years)	6.00			6.00
Expected volatility	70.44	%		80.60	%
Weighted average risk-free interest rate	0.59	%		1.63	%
Expected dividend yield	0.00	%		0.00	%

Summary of stock option activity

				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		173,063		$	25.99
Options exercised		(28,670)		$	0.85
Balance outstanding, March 31, 2021		3,877,705		$	12.85		8.36		$	62,711
Exercisable, March 31, 2021		1,310,142		$	8.80		8.02		$	26,473
Vested and expected to vest, March 31, 2021		3,877,705		$	12.85		8.36		$	62,711

Summary of stock-based compensation expense

		Three Months Ended March 31,
		2021			2020
Classified within research and development expense		$	1,645		$	368
Classified within general and administrative expense			719			869
Total stock-based compensation expense		$	2,364		$	1,237

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
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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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-Publisher FASB
-Name Accounting Standards Codification
-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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