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General and administrative expenses - Stock compensation series (Details) | 12 Months Ended
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Dec. 31, 2018 $ / shares
October 2005 [Member] |
Stock Compensation Series |
Number of stock options | 965
Vesting period | 10 years
Fair value at grant date | $ 144.00
March 2012 [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 13.80
Number of restricted shares | 14,515
June 2013 One [Member] |
Stock Compensation Series |
Vesting period | 4 years
Fair value at grant date | $ 4.15
Number of restricted shares | 155,000
June 2013 Two [Member] |
Stock Compensation Series |
Number of stock options | 155,000
Vesting period | 5 years
Fair value at grant date | $ 1.31
June 2013 Three [Member] |
Stock Compensation Series |
Number of stock options | 155,000
Vesting period | 5 years
Fair value at grant date | $ 0.97
February 2014 One [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 6.92
Number of restricted shares | 29,333
February 2014 Two [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 6.33
Number of restricted shares | 29,333
February 2014 Three [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 5.63
Number of restricted shares | 29,333
February 2014 Four [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 7.61
Number of restricted shares | 88,000
June 2014 One [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 6.41
Number of restricted shares | 95,666
June 2014 Two [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 5.74
Number of restricted shares | 95,666
June 2014 Three [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 5.13
Number of restricted shares | 95,666
June 2014 Four [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 7.15
Number of restricted shares | 287,000
January 2015 [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 8.81
Number of restricted shares | 850,000
January 2016 [Member] |
Stock Compensation Series |
Vesting period | 2 years
Fair value at grant date | $ 6.65
Number of restricted shares | 824,000
January 2017 [Member] |
Stock Compensation Series |
Vesting period | 2 years
Fair value at grant date | $ 4.61
Number of restricted shares | 900,000
January 2018 One [Member] |
Stock Compensation Series |
Vesting period | 1 year
Fair value at grant date | $ 3.92
Number of restricted shares | 355,000
January 2018 Two [Member] |
Stock Compensation Series |
Vesting period | 3 years
Fair value at grant date | $ 2.30
Number of restricted shares | 212,000

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans. + References No definition available. + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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