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Stockholder's equity (deficit) - Restricted stock activity narrative (Details) - shares	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Number of Shares
Unvested restricted common stock	539,827	80,190
Early exercise of unvested stock options	487,933
Restricted stock | Founders [Member]
Number of Shares
Unvested restricted common stock	51,894

X

- Definition

The number of non-vested equity-based payment instruments, early exercise of unvested stock options.

+ References

No definition available.

+ Details

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X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Details

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- Details

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