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Capital structure - Summary of Warrants (Details) - Common stock	Dec. 31, 2018 $ / shares shares
2018
Warrants
Warrant shares (in shares) | shares	7,030
Exercise price (in dollars per share) | $ / shares	$ 128
2019, period two
Warrants
Warrant shares (in shares) | shares	130
Exercise price (in dollars per share) | $ / shares	$ 2,520

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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+ References

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- Definition

Number of warrants or rights outstanding.

+ References

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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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