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Capitalization - Warrants (Details) - Common stock - $ / shares | Mar. 31, 2019 | Dec. 31, 2018
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Debt Instrument, Redemption, Period One [Member] |  |
Warrants |  |
Warrant shares (in shares) | 7,030 | 7,030
Exercise price (in dollars per share) | $ 128.00 | $ 128.00
Debt Instrument, Redemption, Period Five [Member] |  |
Warrants |  |
Warrant shares (in shares) | 130 | 130
Exercise price (in dollars per share) | $ 2,520.00 | $ 2,520.00

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