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Financial risk management, objectives and policies, Convertible Senior Notes due 2019 and 2021 (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 19, 2020 | Dec. 31, 2019 | Oct. 31, 2019 | Aug. 31, 2018 | Sep. 30, 2014 | Dec. 31, 2019
Credit Facility [Abstract] |  |  |  |  |  |
Frequency of periodic repayment |  |  |  |  |  | Quarterly
Convertible Senior Notes due 2019 [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued amount |  |  |  | $ 73,000,000 |  |
Convertible Senior Notes due 2019 [Member] | Samco Ltd [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Frequency of periodic repayment |  |  |  |  |  | Semi annually
Adjustment to interest rate basis |  |  |  |  | 4.50% |
Initial conversion price of common stock (in dollars per share) |  |  |  |  | $ 8.125 |
Initial conversion rate of common stock (in shares) |  |  |  |  | 123.0769 |
Aggregate Principal of Convertible Senior Notes, Subjected to Anti Dilution |  |  |  |  | $ 1,000 |
Amount converted into shares |  |  | $ 26,434,000 |  |  |
Conversion price (in dollars per share) |  |  | $ 6.0216 |  |  |
Amount of aggregate principal repaid in cash |  |  | $ 6,426,000 |  |  |
Convertible Senior Notes due 2019 [Member] | Samco Ltd [Member] | Private Placement [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued amount |  |  |  |  | 150,000,000 |
Net proceeds from after conversion |  |  |  |  | $ 145,500,000 |
Convertible Senior Notes due 2019 [Member] | Samco Ltd [Member] | Common Stock [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Number of shares issued at conversion (in shares) |  |  | 4,389,858 |  |  |
Convertible Senior Notes due 2021 [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued amount |  |  |  | 80,300,000 |  |
Initial conversion rate of common stock (in shares) |  | 167 |  |  |  |
Convertible Senior Notes due 2021 [Member] | Private Placement [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued amount | $ 124,999,000 |  |  | 125,000,000 |  |
Net proceeds from after conversion |  |  |  | $ 38,900,000 |  |
Frequency of periodic repayment |  |  |  |  |  | Semi annually
Adjustment to interest rate basis |  |  |  | 4.50% |  |
Initial conversion price of common stock (in dollars per share) | $ 5.6468 |  |  | $ 6.2599 |  |
Initial conversion rate of common stock (in shares) |  |  |  | 159.7470 |  |
Principal amount of convertible senior notes issued amount |  |  |  | $ 44,700,000 |  |
Aggregate Principal of Convertible Senior Notes, Subjected to Anti Dilution |  | $ 1,000 |  | 1,000 |  |
Net proceeds from conversion of senior notes |  |  |  | $ 41,600,000 |  |
Aggregate number of shares of common stock to be issued at conversion (in shares) |  | 22,136,254 |  |  |  | 22,136,254
Maturity date |  | August 15, 2021 |  |  |  |

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