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Stock-based awards (Tables)

6 Months Ended

Jun. 30, 2019

Stock-based awards

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

		Three Months Ended					Six Months Ended
		June 30,					June 30,
		2019			2018		2019			2018
Expected term (in years)			6.07		n/a			6.04		n/a
Volatility			71.20	%	n/a			69.80	%	n/a
Risk-free interest rate			2.28	%	n/a			2.39	%	n/a
Dividend yield			0.00	%	n/a			0.00	%	n/a
Weighted average fair value of common stock		$	9.72		n/a		$	8.26		n/a

Summary of stock option activity

				Weighted-			Weighted-
				Average			Average
				Exercise			remaining		Aggregate
		Number		Price per			contractual		Intrinsic
		of Options		Share			term (years)		Value
Balance Outstanding, December 31, 2018		1,839,913		$	0.61		9.74		$	10,577
Options granted		1,228,352		$	7.61
Options exercised		(647,757)		$	0.62
Balance Outstanding, June 30, 2019		2,420,508		$	4.17		9.48		$	36,271
Exercisable, June 30, 2019		23,691		$	4.17		9.42		$	352
Vested and expected to vest, June 30, 2019		2,420,508		$	4.29		9.48		$	36,271

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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