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Capital structure (Details 2) - Common stock - $ / shares	Dec. 31, 2016	Dec. 31, 2015
2017
Warrants
Warrant shares (in shares)	6,250	6,250
Exercise price (in dollars per share)	$ 128.00	$ 128.00
2018
Warrants
Warrant shares (in shares)	7,030	7,030
Exercise price (in dollars per share)	$ 128.00	$ 128.00
2019
Warrants
Warrant shares (in shares)	130	130
Exercise price (in dollars per share)	$ 2,520.00	$ 2,520.00

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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