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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
--- | --- | --- | ---
Aug. 21, 2020 | Dec. 31, 2019 | Oct. 31, 2019 | Aug. 31, 2018 | Sep. 30, 2014 | Dec. 31, 2021
Convertible Senior Notes due 2019 [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued |  |  |  | $ 73,000,000.0 |  |
Convertible Senior Notes due 2019 [Member] | Private Placement [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  | 4.50% |  |
Convertible Senior Notes due 2019 [Member] | Samco Ltd [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Frequency of periodic repayment |  |  |  |  |  | semiannually
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 amount 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 |  |  |
Number of shares issued at conversion (in shares) |  |  | 4,389,858 |  |  |
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 |  |  |  |  | 150,000,000 |
Net proceeds from after conversion |  |  |  |  | $ 145,500,000 |
Convertible Senior Notes due 2021 [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued |  |  |  | $ 80,300,000 |  |
Adjustment to interest rate basis |  |  |  | 4.50% |  |
Initial conversion price of common stock (in dollars per share) | $ 5.3470 |  |  |  |  |
Initial conversion rate of common stock (in shares) | 187.0208 | 167 |  |  |  |
Aggregate principal amount of convertible senior notes, subjected to anti-dilution | $ 1,000 | $ 1,000 |  |  |  |
Aggregate number of shares of common stock to be issued at conversion (in shares) | 23,377,397 |  |  |  |  |
Percentage of principal amount plus accrued and unpaid interest to be redeemed |  |  |  |  |  | 100.00%
Convertible Senior Notes due 2021 [Member] | Private Placement [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued |  | $ 124,999,000 |  | $ 125,000,000.0 |  |
Net proceeds from after conversion |  |  |  | $ 38,900,000 |  |
Frequency of periodic repayment |  |  |  |  |  | semiannually
Adjustment to interest rate basis |  |  |  | 4.50% |  |
Initial conversion price of common stock (in dollars per share) |  |  |  | $ 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 amount of convertible senior notes, subjected to anti-dilution |  |  |  | 1,000 |  |
Net proceeds from conversion of senior notes |  |  |  | $ 41,600,000 |  |

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