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Capital structure - Summary of Warrants (Details) - Common stock | Dec. 31, 2018 $ / shares shares
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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

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