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Stockholder's equity (deficit) - Restricted stock activity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) shares
Number of Shares
Beginning balance of unvested restricted common stock	80,190
Early exercise of unvested stock options	487,933
Vested	(28,296)
Ending balance of unvested restricted common stock	539,827
Grant-Date Fair Value
Early exercise of unvested stock options | $	$ 435
Ending balance of unvested restricted common stock | $	$ 435

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

Fair value of share-based awards for which the grantee gained the right by early exercising of unvested stock options.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

No definition available.

+ Details

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- References

No definition available.

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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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X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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

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