Fair value measurement - Sensitivity analysis on warrants (Details) - BMS Warrants $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Fair value measurements
Base case	$ 504
Increase volatility by 10% to 85%	165
Extend exercise dates by one year	$ 58

Warrants And Rights Outstanding, Assumed Fair Value If extension in exercise date

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- Definition

Warrants And Rights Outstanding, Assumed Fair Value If Increase in Volatility Rate

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ 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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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